diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 9a0bd1b..8ec98fc 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -18,7 +18,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        go-version: [ oldstable, stable ]
+        go-version: [ 1.19.x, oldstable, stable ]
     steps:
       - name: Checkout code
         uses: actions/checkout@v4
@@ -34,11 +34,4 @@ jobs:
         # Often, lint guidelines depend on the Go version. To prevent
         # conflicting guidance, run only on the most recent supported version.
         if: matrix.go-version == 'stable'
-        uses: golangci/golangci-lint-action@v3
-        with:
-          skip-pkg-cache: true
-          only-new-issues: true
-          args: >
-            --modules-download-mode=readonly
-            --timeout=3m0s
-            ./... 
+        run: make lint
diff --git a/Makefile b/Makefile
index da1af02..037ccec 100644
--- a/Makefile
+++ b/Makefile
@@ -15,7 +15,7 @@ ARGS ?= --strict --strict_message --strict_error
 # Set to use a different version of protovalidate-conformance.
 # Should be kept in sync with the version referenced in proto/buf.lock and
 # 'buf.build/gen/go/bufbuild/protovalidate/protocolbuffers/go' in go.mod.
-CONFORMANCE_VERSION ?= v0.4.3
+CONFORMANCE_VERSION ?= v0.5.1
 
 .PHONY: help
 help: ## Describe useful make targets
@@ -38,7 +38,7 @@ lint: lint-proto lint-go  ## Lint code and protos
 
 .PHONY: lint-go
 lint-go: $(BIN)/golangci-lint
-	$(BIN)/golangci-lint run ./...
+	$(BIN)/golangci-lint run --modules-download-mode=readonly --timeout=3m0s ./...
 
 .PHONY: lint-proto
 lint-proto: $(BIN)/buf
diff --git a/README.md b/README.md
index 8f4b703..4361613 100644
--- a/README.md
+++ b/README.md
@@ -34,6 +34,8 @@ And others coming soon:
 
 - TypeScript: `protovalidate-ts`
 
+For `Connect` see [connectrpc/validate-go](https://github.com/connectrpc/validate-go).
+
 ## Installation
 
 **Requires the `go` toolchain (≥ v1.19)**
diff --git a/celext/lib.go b/celext/lib.go
index fa472dd..ae027c1 100644
--- a/celext/lib.go
+++ b/celext/lib.go
@@ -19,6 +19,7 @@ import (
 	"math"
 	"net"
 	"net/mail"
+	"net/netip"
 	"net/url"
 	"strings"
 
@@ -168,6 +169,56 @@ func (l lib) CompileOptions() []cel.EnvOption {
 					return types.Bool(l.validateIP(addr, vers))
 				})),
 		),
+		cel.Function("isIpPrefix",
+			cel.MemberOverload(
+				"string_is_ip_prefix_bool",
+				[]*cel.Type{cel.StringType},
+				cel.BoolType,
+				cel.FunctionBinding(func(args ...ref.Val) ref.Val {
+					prefix, ok := args[0].Value().(string)
+					if !ok {
+						return types.Bool(false)
+					}
+					return types.Bool(l.validateIPPrefix(prefix, 0, false))
+				})),
+			cel.MemberOverload(
+				"string_int_is_ip_prefix_bool",
+				[]*cel.Type{cel.StringType, cel.IntType},
+				cel.BoolType,
+				cel.FunctionBinding(func(args ...ref.Val) ref.Val {
+					prefix, pok := args[0].Value().(string)
+					vers, vok := args[1].Value().(int64)
+					if !pok || !vok {
+						return types.Bool(false)
+					}
+					return types.Bool(l.validateIPPrefix(prefix, vers, false))
+				})),
+			cel.MemberOverload(
+				"string_bool_is_ip_prefix_bool",
+				[]*cel.Type{cel.StringType, cel.BoolType},
+				cel.BoolType,
+				cel.FunctionBinding(func(args ...ref.Val) ref.Val {
+					prefix, pok := args[0].Value().(string)
+					strict, sok := args[1].Value().(bool)
+					if !pok || !sok {
+						return types.Bool(false)
+					}
+					return types.Bool(l.validateIPPrefix(prefix, 0, strict))
+				})),
+			cel.MemberOverload(
+				"string_int_bool_is_ip_prefix_bool",
+				[]*cel.Type{cel.StringType, cel.IntType, cel.BoolType},
+				cel.BoolType,
+				cel.FunctionBinding(func(args ...ref.Val) ref.Val {
+					prefix, pok := args[0].Value().(string)
+					vers, vok := args[1].Value().(int64)
+					strict, sok := args[2].Value().(bool)
+					if !pok || !vok || !sok {
+						return types.Bool(false)
+					}
+					return types.Bool(l.validateIPPrefix(prefix, vers, strict))
+				})),
+		),
 		cel.Function("isUri",
 			cel.MemberOverload(
 				"string_is_uri_bool",
@@ -371,3 +422,23 @@ func (l lib) validateIP(addr string, ver int64) bool {
 		return false
 	}
 }
+
+func (l lib) validateIPPrefix(p string, ver int64, strict bool) bool {
+	prefix, err := netip.ParsePrefix(p)
+	if err != nil {
+		return false
+	}
+	if strict && (prefix.Addr() != prefix.Masked().Addr()) {
+		return false
+	}
+	switch ver {
+	case 0:
+		return true
+	case 4:
+		return prefix.Addr().Is4()
+	case 6:
+		return prefix.Addr().Is6()
+	default:
+		return false
+	}
+}
diff --git a/celext/lib_test.go b/celext/lib_test.go
index 14789cb..ec369c1 100644
--- a/celext/lib_test.go
+++ b/celext/lib_test.go
@@ -101,6 +101,82 @@ func TestCELLib(t *testing.T) {
 				"[b'123', b'123'].unique()",
 				false,
 			},
+			{
+				"'1.2.3.0/24'.isIpPrefix()",
+				true,
+			},
+			{
+				"'1.2.3.4/24'.isIpPrefix()",
+				true,
+			},
+			{
+				"'1.2.3.0/24'.isIpPrefix(true)",
+				true,
+			},
+			{
+				"'1.2.3.4/24'.isIpPrefix(true)",
+				false,
+			},
+			{
+				"'fd7a:115c:a1e0:ab12:4843:cd96:626b:4000/118'.isIpPrefix()",
+				true,
+			},
+			{
+				"'fd7a:115c:a1e0:ab12:4843:cd96:626b:430b/118'.isIpPrefix()",
+				true,
+			},
+			{
+				"'fd7a:115c:a1e0:ab12:4843:cd96:626b:430b/118'.isIpPrefix(true)",
+				false,
+			},
+			{
+				"'1.2.3.4'.isIpPrefix()",
+				false,
+			},
+			{
+				"'fd7a:115c:a1e0:ab12:4843:cd96:626b:430b'.isIpPrefix()",
+				false,
+			},
+			{
+				"'1.2.3.0/24'.isIpPrefix(4)",
+				true,
+			},
+			{
+				"'1.2.3.4/24'.isIpPrefix(4)",
+				true,
+			},
+			{
+				"'1.2.3.0/24'.isIpPrefix(4,true)",
+				true,
+			},
+			{
+				"'1.2.3.4/24'.isIpPrefix(4,true)",
+				false,
+			},
+			{
+				"'fd7a:115c:a1e0:ab12:4843:cd96:626b:4000/118'.isIpPrefix(4)",
+				false,
+			},
+			{
+				"'fd7a:115c:a1e0:ab12:4843:cd96:626b:4000/118'.isIpPrefix(6)",
+				true,
+			},
+			{
+				"'fd7a:115c:a1e0:ab12:4843:cd96:626b:430b/118'.isIpPrefix(6)",
+				true,
+			},
+			{
+				"'fd7a:115c:a1e0:ab12:4843:cd96:626b:4000/118'.isIpPrefix(6,true)",
+				true,
+			},
+			{
+				"'fd7a:115c:a1e0:ab12:4843:cd96:626b:430b/118'.isIpPrefix(6,true)",
+				false,
+			},
+			{
+				"'1.2.3.0/24'.isIpPrefix(6)",
+				false,
+			},
 		}
 
 		for _, tc := range tests {
diff --git a/go.mod b/go.mod
index 7f576fc..2326076 100644
--- a/go.mod
+++ b/go.mod
@@ -3,7 +3,7 @@ module github.com/bufbuild/protovalidate-go
 go 1.19
 
 require (
-	buf.build/gen/go/bufbuild/protovalidate/protocolbuffers/go v1.31.0-20230914171853-63dfe56cc2c4.1
+	buf.build/gen/go/bufbuild/protovalidate/protocolbuffers/go v1.31.0-20231030212536-12f9cba37c9d.2
 	github.com/envoyproxy/protoc-gen-validate v1.0.2
 	github.com/google/cel-go v0.18.1
 	github.com/stretchr/testify v1.8.4
diff --git a/go.sum b/go.sum
index 5e71657..ff6dc9f 100644
--- a/go.sum
+++ b/go.sum
@@ -1,5 +1,7 @@
 buf.build/gen/go/bufbuild/protovalidate/protocolbuffers/go v1.31.0-20230914171853-63dfe56cc2c4.1 h1:2gmp+PRca1fqQHf/WMKOgu9inVb0R0N07TucgY3QZCQ=
 buf.build/gen/go/bufbuild/protovalidate/protocolbuffers/go v1.31.0-20230914171853-63dfe56cc2c4.1/go.mod h1:xafc+XIsTxTy76GJQ1TKgvJWsSugFBqMaN27WhUblew=
+buf.build/gen/go/bufbuild/protovalidate/protocolbuffers/go v1.31.0-20231030212536-12f9cba37c9d.2 h1:m8rKyv88R8ZIR1549RMXckZ4FZJGxrq/7aRYl6U3WHc=
+buf.build/gen/go/bufbuild/protovalidate/protocolbuffers/go v1.31.0-20231030212536-12f9cba37c9d.2/go.mod h1:xafc+XIsTxTy76GJQ1TKgvJWsSugFBqMaN27WhUblew=
 github.com/antlr/antlr4/runtime/Go/antlr/v4 v4.0.0-20230512164433-5d1fd1a340c9 h1:goHVqTbFX3AIo0tzGr14pgfAW2ZfPChKO21Z9MGf/gk=
 github.com/antlr/antlr4/runtime/Go/antlr/v4 v4.0.0-20230512164433-5d1fd1a340c9/go.mod h1:pSwJ0fSY5KhvocuWSx4fz3BA8OrA1bQn+K1Eli3BRwM=
 github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
diff --git a/internal/evaluator/builder.go b/internal/evaluator/builder.go
index 6e44b6a..d651dbb 100644
--- a/internal/evaluator/builder.go
+++ b/internal/evaluator/builder.go
@@ -274,6 +274,7 @@ func (bldr *Builder) processFieldExpressions(
 	var opts []cel.EnvOption
 	if fieldDesc.Kind() == protoreflect.MessageKind {
 		opts = []cel.EnvOption{
+			cel.Types(dynamicpb.NewMessage(fieldDesc.ContainingMessage())),
 			cel.Types(dynamicpb.NewMessage(fieldDesc.Message())),
 			cel.Variable("this", cel.ObjectType(string(fieldDesc.Message().FullName()))),
 		}
diff --git a/internal/gen/buf/validate/conformance/cases/strings.pb.go b/internal/gen/buf/validate/conformance/cases/strings.pb.go
index f888d3b..5a5ab1b 100644
--- a/internal/gen/buf/validate/conformance/cases/strings.pb.go
+++ b/internal/gen/buf/validate/conformance/cases/strings.pb.go
@@ -1257,6 +1257,288 @@ func (x *StringIPv6) GetVal() string {
 	return ""
 }
 
+type StringIPWithPrefixLen struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Val string `protobuf:"bytes,1,opt,name=val,proto3" json:"val,omitempty"`
+}
+
+func (x *StringIPWithPrefixLen) Reset() {
+	*x = StringIPWithPrefixLen{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_buf_validate_conformance_cases_strings_proto_msgTypes[26]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *StringIPWithPrefixLen) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*StringIPWithPrefixLen) ProtoMessage() {}
+
+func (x *StringIPWithPrefixLen) ProtoReflect() protoreflect.Message {
+	mi := &file_buf_validate_conformance_cases_strings_proto_msgTypes[26]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use StringIPWithPrefixLen.ProtoReflect.Descriptor instead.
+func (*StringIPWithPrefixLen) Descriptor() ([]byte, []int) {
+	return file_buf_validate_conformance_cases_strings_proto_rawDescGZIP(), []int{26}
+}
+
+func (x *StringIPWithPrefixLen) GetVal() string {
+	if x != nil {
+		return x.Val
+	}
+	return ""
+}
+
+type StringIPv4WithPrefixLen struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Val string `protobuf:"bytes,1,opt,name=val,proto3" json:"val,omitempty"`
+}
+
+func (x *StringIPv4WithPrefixLen) Reset() {
+	*x = StringIPv4WithPrefixLen{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_buf_validate_conformance_cases_strings_proto_msgTypes[27]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *StringIPv4WithPrefixLen) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*StringIPv4WithPrefixLen) ProtoMessage() {}
+
+func (x *StringIPv4WithPrefixLen) ProtoReflect() protoreflect.Message {
+	mi := &file_buf_validate_conformance_cases_strings_proto_msgTypes[27]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use StringIPv4WithPrefixLen.ProtoReflect.Descriptor instead.
+func (*StringIPv4WithPrefixLen) Descriptor() ([]byte, []int) {
+	return file_buf_validate_conformance_cases_strings_proto_rawDescGZIP(), []int{27}
+}
+
+func (x *StringIPv4WithPrefixLen) GetVal() string {
+	if x != nil {
+		return x.Val
+	}
+	return ""
+}
+
+type StringIPv6WithPrefixLen struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Val string `protobuf:"bytes,1,opt,name=val,proto3" json:"val,omitempty"`
+}
+
+func (x *StringIPv6WithPrefixLen) Reset() {
+	*x = StringIPv6WithPrefixLen{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_buf_validate_conformance_cases_strings_proto_msgTypes[28]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *StringIPv6WithPrefixLen) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*StringIPv6WithPrefixLen) ProtoMessage() {}
+
+func (x *StringIPv6WithPrefixLen) ProtoReflect() protoreflect.Message {
+	mi := &file_buf_validate_conformance_cases_strings_proto_msgTypes[28]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use StringIPv6WithPrefixLen.ProtoReflect.Descriptor instead.
+func (*StringIPv6WithPrefixLen) Descriptor() ([]byte, []int) {
+	return file_buf_validate_conformance_cases_strings_proto_rawDescGZIP(), []int{28}
+}
+
+func (x *StringIPv6WithPrefixLen) GetVal() string {
+	if x != nil {
+		return x.Val
+	}
+	return ""
+}
+
+type StringIPPrefix struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Val string `protobuf:"bytes,1,opt,name=val,proto3" json:"val,omitempty"`
+}
+
+func (x *StringIPPrefix) Reset() {
+	*x = StringIPPrefix{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_buf_validate_conformance_cases_strings_proto_msgTypes[29]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *StringIPPrefix) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*StringIPPrefix) ProtoMessage() {}
+
+func (x *StringIPPrefix) ProtoReflect() protoreflect.Message {
+	mi := &file_buf_validate_conformance_cases_strings_proto_msgTypes[29]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use StringIPPrefix.ProtoReflect.Descriptor instead.
+func (*StringIPPrefix) Descriptor() ([]byte, []int) {
+	return file_buf_validate_conformance_cases_strings_proto_rawDescGZIP(), []int{29}
+}
+
+func (x *StringIPPrefix) GetVal() string {
+	if x != nil {
+		return x.Val
+	}
+	return ""
+}
+
+type StringIPv4Prefix struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Val string `protobuf:"bytes,1,opt,name=val,proto3" json:"val,omitempty"`
+}
+
+func (x *StringIPv4Prefix) Reset() {
+	*x = StringIPv4Prefix{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_buf_validate_conformance_cases_strings_proto_msgTypes[30]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *StringIPv4Prefix) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*StringIPv4Prefix) ProtoMessage() {}
+
+func (x *StringIPv4Prefix) ProtoReflect() protoreflect.Message {
+	mi := &file_buf_validate_conformance_cases_strings_proto_msgTypes[30]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use StringIPv4Prefix.ProtoReflect.Descriptor instead.
+func (*StringIPv4Prefix) Descriptor() ([]byte, []int) {
+	return file_buf_validate_conformance_cases_strings_proto_rawDescGZIP(), []int{30}
+}
+
+func (x *StringIPv4Prefix) GetVal() string {
+	if x != nil {
+		return x.Val
+	}
+	return ""
+}
+
+type StringIPv6Prefix struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Val string `protobuf:"bytes,1,opt,name=val,proto3" json:"val,omitempty"`
+}
+
+func (x *StringIPv6Prefix) Reset() {
+	*x = StringIPv6Prefix{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_buf_validate_conformance_cases_strings_proto_msgTypes[31]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *StringIPv6Prefix) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*StringIPv6Prefix) ProtoMessage() {}
+
+func (x *StringIPv6Prefix) ProtoReflect() protoreflect.Message {
+	mi := &file_buf_validate_conformance_cases_strings_proto_msgTypes[31]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use StringIPv6Prefix.ProtoReflect.Descriptor instead.
+func (*StringIPv6Prefix) Descriptor() ([]byte, []int) {
+	return file_buf_validate_conformance_cases_strings_proto_rawDescGZIP(), []int{31}
+}
+
+func (x *StringIPv6Prefix) GetVal() string {
+	if x != nil {
+		return x.Val
+	}
+	return ""
+}
+
 type StringURI struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -1268,7 +1550,7 @@ type StringURI struct {
 func (x *StringURI) Reset() {
 	*x = StringURI{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_buf_validate_conformance_cases_strings_proto_msgTypes[26]
+		mi := &file_buf_validate_conformance_cases_strings_proto_msgTypes[32]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1281,7 +1563,7 @@ func (x *StringURI) String() string {
 func (*StringURI) ProtoMessage() {}
 
 func (x *StringURI) ProtoReflect() protoreflect.Message {
-	mi := &file_buf_validate_conformance_cases_strings_proto_msgTypes[26]
+	mi := &file_buf_validate_conformance_cases_strings_proto_msgTypes[32]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1294,7 +1576,7 @@ func (x *StringURI) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use StringURI.ProtoReflect.Descriptor instead.
 func (*StringURI) Descriptor() ([]byte, []int) {
-	return file_buf_validate_conformance_cases_strings_proto_rawDescGZIP(), []int{26}
+	return file_buf_validate_conformance_cases_strings_proto_rawDescGZIP(), []int{32}
 }
 
 func (x *StringURI) GetVal() string {
@@ -1315,7 +1597,7 @@ type StringURIRef struct {
 func (x *StringURIRef) Reset() {
 	*x = StringURIRef{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_buf_validate_conformance_cases_strings_proto_msgTypes[27]
+		mi := &file_buf_validate_conformance_cases_strings_proto_msgTypes[33]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1328,7 +1610,7 @@ func (x *StringURIRef) String() string {
 func (*StringURIRef) ProtoMessage() {}
 
 func (x *StringURIRef) ProtoReflect() protoreflect.Message {
-	mi := &file_buf_validate_conformance_cases_strings_proto_msgTypes[27]
+	mi := &file_buf_validate_conformance_cases_strings_proto_msgTypes[33]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1341,7 +1623,7 @@ func (x *StringURIRef) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use StringURIRef.ProtoReflect.Descriptor instead.
 func (*StringURIRef) Descriptor() ([]byte, []int) {
-	return file_buf_validate_conformance_cases_strings_proto_rawDescGZIP(), []int{27}
+	return file_buf_validate_conformance_cases_strings_proto_rawDescGZIP(), []int{33}
 }
 
 func (x *StringURIRef) GetVal() string {
@@ -1362,7 +1644,7 @@ type StringUUID struct {
 func (x *StringUUID) Reset() {
 	*x = StringUUID{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_buf_validate_conformance_cases_strings_proto_msgTypes[28]
+		mi := &file_buf_validate_conformance_cases_strings_proto_msgTypes[34]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1375,7 +1657,7 @@ func (x *StringUUID) String() string {
 func (*StringUUID) ProtoMessage() {}
 
 func (x *StringUUID) ProtoReflect() protoreflect.Message {
-	mi := &file_buf_validate_conformance_cases_strings_proto_msgTypes[28]
+	mi := &file_buf_validate_conformance_cases_strings_proto_msgTypes[34]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1388,7 +1670,7 @@ func (x *StringUUID) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use StringUUID.ProtoReflect.Descriptor instead.
 func (*StringUUID) Descriptor() ([]byte, []int) {
-	return file_buf_validate_conformance_cases_strings_proto_rawDescGZIP(), []int{28}
+	return file_buf_validate_conformance_cases_strings_proto_rawDescGZIP(), []int{34}
 }
 
 func (x *StringUUID) GetVal() string {
@@ -1409,7 +1691,7 @@ type StringHttpHeaderName struct {
 func (x *StringHttpHeaderName) Reset() {
 	*x = StringHttpHeaderName{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_buf_validate_conformance_cases_strings_proto_msgTypes[29]
+		mi := &file_buf_validate_conformance_cases_strings_proto_msgTypes[35]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1422,7 +1704,7 @@ func (x *StringHttpHeaderName) String() string {
 func (*StringHttpHeaderName) ProtoMessage() {}
 
 func (x *StringHttpHeaderName) ProtoReflect() protoreflect.Message {
-	mi := &file_buf_validate_conformance_cases_strings_proto_msgTypes[29]
+	mi := &file_buf_validate_conformance_cases_strings_proto_msgTypes[35]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1435,7 +1717,7 @@ func (x *StringHttpHeaderName) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use StringHttpHeaderName.ProtoReflect.Descriptor instead.
 func (*StringHttpHeaderName) Descriptor() ([]byte, []int) {
-	return file_buf_validate_conformance_cases_strings_proto_rawDescGZIP(), []int{29}
+	return file_buf_validate_conformance_cases_strings_proto_rawDescGZIP(), []int{35}
 }
 
 func (x *StringHttpHeaderName) GetVal() string {
@@ -1456,7 +1738,7 @@ type StringHttpHeaderValue struct {
 func (x *StringHttpHeaderValue) Reset() {
 	*x = StringHttpHeaderValue{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_buf_validate_conformance_cases_strings_proto_msgTypes[30]
+		mi := &file_buf_validate_conformance_cases_strings_proto_msgTypes[36]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1469,7 +1751,7 @@ func (x *StringHttpHeaderValue) String() string {
 func (*StringHttpHeaderValue) ProtoMessage() {}
 
 func (x *StringHttpHeaderValue) ProtoReflect() protoreflect.Message {
-	mi := &file_buf_validate_conformance_cases_strings_proto_msgTypes[30]
+	mi := &file_buf_validate_conformance_cases_strings_proto_msgTypes[36]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1482,7 +1764,7 @@ func (x *StringHttpHeaderValue) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use StringHttpHeaderValue.ProtoReflect.Descriptor instead.
 func (*StringHttpHeaderValue) Descriptor() ([]byte, []int) {
-	return file_buf_validate_conformance_cases_strings_proto_rawDescGZIP(), []int{30}
+	return file_buf_validate_conformance_cases_strings_proto_rawDescGZIP(), []int{36}
 }
 
 func (x *StringHttpHeaderValue) GetVal() string {
@@ -1503,7 +1785,7 @@ type StringHttpHeaderNameLoose struct {
 func (x *StringHttpHeaderNameLoose) Reset() {
 	*x = StringHttpHeaderNameLoose{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_buf_validate_conformance_cases_strings_proto_msgTypes[31]
+		mi := &file_buf_validate_conformance_cases_strings_proto_msgTypes[37]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1516,7 +1798,7 @@ func (x *StringHttpHeaderNameLoose) String() string {
 func (*StringHttpHeaderNameLoose) ProtoMessage() {}
 
 func (x *StringHttpHeaderNameLoose) ProtoReflect() protoreflect.Message {
-	mi := &file_buf_validate_conformance_cases_strings_proto_msgTypes[31]
+	mi := &file_buf_validate_conformance_cases_strings_proto_msgTypes[37]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1529,7 +1811,7 @@ func (x *StringHttpHeaderNameLoose) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use StringHttpHeaderNameLoose.ProtoReflect.Descriptor instead.
 func (*StringHttpHeaderNameLoose) Descriptor() ([]byte, []int) {
-	return file_buf_validate_conformance_cases_strings_proto_rawDescGZIP(), []int{31}
+	return file_buf_validate_conformance_cases_strings_proto_rawDescGZIP(), []int{37}
 }
 
 func (x *StringHttpHeaderNameLoose) GetVal() string {
@@ -1550,7 +1832,7 @@ type StringHttpHeaderValueLoose struct {
 func (x *StringHttpHeaderValueLoose) Reset() {
 	*x = StringHttpHeaderValueLoose{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_buf_validate_conformance_cases_strings_proto_msgTypes[32]
+		mi := &file_buf_validate_conformance_cases_strings_proto_msgTypes[38]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1563,7 +1845,7 @@ func (x *StringHttpHeaderValueLoose) String() string {
 func (*StringHttpHeaderValueLoose) ProtoMessage() {}
 
 func (x *StringHttpHeaderValueLoose) ProtoReflect() protoreflect.Message {
-	mi := &file_buf_validate_conformance_cases_strings_proto_msgTypes[32]
+	mi := &file_buf_validate_conformance_cases_strings_proto_msgTypes[38]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1576,7 +1858,7 @@ func (x *StringHttpHeaderValueLoose) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use StringHttpHeaderValueLoose.ProtoReflect.Descriptor instead.
 func (*StringHttpHeaderValueLoose) Descriptor() ([]byte, []int) {
-	return file_buf_validate_conformance_cases_strings_proto_rawDescGZIP(), []int{32}
+	return file_buf_validate_conformance_cases_strings_proto_rawDescGZIP(), []int{38}
 }
 
 func (x *StringHttpHeaderValueLoose) GetVal() string {
@@ -1597,7 +1879,7 @@ type StringUUIDIgnore struct {
 func (x *StringUUIDIgnore) Reset() {
 	*x = StringUUIDIgnore{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_buf_validate_conformance_cases_strings_proto_msgTypes[33]
+		mi := &file_buf_validate_conformance_cases_strings_proto_msgTypes[39]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1610,7 +1892,7 @@ func (x *StringUUIDIgnore) String() string {
 func (*StringUUIDIgnore) ProtoMessage() {}
 
 func (x *StringUUIDIgnore) ProtoReflect() protoreflect.Message {
-	mi := &file_buf_validate_conformance_cases_strings_proto_msgTypes[33]
+	mi := &file_buf_validate_conformance_cases_strings_proto_msgTypes[39]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1623,7 +1905,7 @@ func (x *StringUUIDIgnore) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use StringUUIDIgnore.ProtoReflect.Descriptor instead.
 func (*StringUUIDIgnore) Descriptor() ([]byte, []int) {
-	return file_buf_validate_conformance_cases_strings_proto_rawDescGZIP(), []int{33}
+	return file_buf_validate_conformance_cases_strings_proto_rawDescGZIP(), []int{39}
 }
 
 func (x *StringUUIDIgnore) GetVal() string {
@@ -1647,7 +1929,7 @@ type StringInOneof struct {
 func (x *StringInOneof) Reset() {
 	*x = StringInOneof{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_buf_validate_conformance_cases_strings_proto_msgTypes[34]
+		mi := &file_buf_validate_conformance_cases_strings_proto_msgTypes[40]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1660,7 +1942,7 @@ func (x *StringInOneof) String() string {
 func (*StringInOneof) ProtoMessage() {}
 
 func (x *StringInOneof) ProtoReflect() protoreflect.Message {
-	mi := &file_buf_validate_conformance_cases_strings_proto_msgTypes[34]
+	mi := &file_buf_validate_conformance_cases_strings_proto_msgTypes[40]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1673,7 +1955,7 @@ func (x *StringInOneof) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use StringInOneof.ProtoReflect.Descriptor instead.
 func (*StringInOneof) Descriptor() ([]byte, []int) {
-	return file_buf_validate_conformance_cases_strings_proto_rawDescGZIP(), []int{34}
+	return file_buf_validate_conformance_cases_strings_proto_rawDescGZIP(), []int{40}
 }
 
 func (m *StringInOneof) GetFoo() isStringInOneof_Foo {
@@ -1785,54 +2067,73 @@ var file_buf_validate_conformance_cases_strings_proto_rawDesc = []byte{
 	0x04, 0x72, 0x02, 0x78, 0x01, 0x52, 0x03, 0x76, 0x61, 0x6c, 0x22, 0x28, 0x0a, 0x0a, 0x53, 0x74,
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+	0x6c, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09, 0x42, 0x0b, 0xba, 0x48, 0x08, 0xd0, 0x01, 0x01, 0x72,
+	0x03, 0xb0, 0x01, 0x01, 0x52, 0x03, 0x76, 0x61, 0x6c, 0x22, 0x37, 0x0a, 0x0d, 0x53, 0x74, 0x72,
+	0x69, 0x6e, 0x67, 0x49, 0x6e, 0x4f, 0x6e, 0x65, 0x6f, 0x66, 0x12, 0x1f, 0x0a, 0x03, 0x62, 0x61,
+	0x72, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09, 0x42, 0x0b, 0xba, 0x48, 0x08, 0x72, 0x06, 0x52, 0x01,
+	0x61, 0x52, 0x01, 0x62, 0x48, 0x00, 0x52, 0x03, 0x62, 0x61, 0x72, 0x42, 0x05, 0x0a, 0x03, 0x66,
+	0x6f, 0x6f, 0x42, 0xa0, 0x02, 0x0a, 0x22, 0x63, 0x6f, 0x6d, 0x2e, 0x62, 0x75, 0x66, 0x2e, 0x76,
+	0x61, 0x6c, 0x69, 0x64, 0x61, 0x74, 0x65, 0x2e, 0x63, 0x6f, 0x6e, 0x66, 0x6f, 0x72, 0x6d, 0x61,
+	0x6e, 0x63, 0x65, 0x2e, 0x63, 0x61, 0x73, 0x65, 0x73, 0x42, 0x0c, 0x53, 0x74, 0x72, 0x69, 0x6e,
+	0x67, 0x73, 0x50, 0x72, 0x6f, 0x74, 0x6f, 0x50, 0x01, 0x5a, 0x50, 0x67, 0x69, 0x74, 0x68, 0x75,
+	0x62, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x62, 0x75, 0x66, 0x62, 0x75, 0x69, 0x6c, 0x64, 0x2f, 0x70,
+	0x72, 0x6f, 0x74, 0x6f, 0x76, 0x61, 0x6c, 0x69, 0x64, 0x61, 0x74, 0x65, 0x2d, 0x67, 0x6f, 0x2f,
+	0x69, 0x6e, 0x74, 0x65, 0x72, 0x6e, 0x61, 0x6c, 0x2f, 0x67, 0x65, 0x6e, 0x2f, 0x62, 0x75, 0x66,
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+	0x6d, 0x61, 0x6e, 0x63, 0x65, 0x2f, 0x63, 0x61, 0x73, 0x65, 0x73, 0xa2, 0x02, 0x04, 0x42, 0x56,
+	0x43, 0x43, 0xaa, 0x02, 0x1e, 0x42, 0x75, 0x66, 0x2e, 0x56, 0x61, 0x6c, 0x69, 0x64, 0x61, 0x74,
+	0x65, 0x2e, 0x43, 0x6f, 0x6e, 0x66, 0x6f, 0x72, 0x6d, 0x61, 0x6e, 0x63, 0x65, 0x2e, 0x43, 0x61,
+	0x73, 0x65, 0x73, 0xca, 0x02, 0x1e, 0x42, 0x75, 0x66, 0x5c, 0x56, 0x61, 0x6c, 0x69, 0x64, 0x61,
 	0x74, 0x65, 0x5c, 0x43, 0x6f, 0x6e, 0x66, 0x6f, 0x72, 0x6d, 0x61, 0x6e, 0x63, 0x65, 0x5c, 0x43,
-	0x61, 0x73, 0x65, 0x73, 0x5c, 0x47, 0x50, 0x42, 0x4d, 0x65, 0x74, 0x61, 0x64, 0x61, 0x74, 0x61,
-	0xea, 0x02, 0x21, 0x42, 0x75, 0x66, 0x3a, 0x3a, 0x56, 0x61, 0x6c, 0x69, 0x64, 0x61, 0x74, 0x65,
-	0x3a, 0x3a, 0x43, 0x6f, 0x6e, 0x66, 0x6f, 0x72, 0x6d, 0x61, 0x6e, 0x63, 0x65, 0x3a, 0x3a, 0x43,
-	0x61, 0x73, 0x65, 0x73, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
+	0x61, 0x73, 0x65, 0x73, 0xe2, 0x02, 0x2a, 0x42, 0x75, 0x66, 0x5c, 0x56, 0x61, 0x6c, 0x69, 0x64,
+	0x61, 0x74, 0x65, 0x5c, 0x43, 0x6f, 0x6e, 0x66, 0x6f, 0x72, 0x6d, 0x61, 0x6e, 0x63, 0x65, 0x5c,
+	0x43, 0x61, 0x73, 0x65, 0x73, 0x5c, 0x47, 0x50, 0x42, 0x4d, 0x65, 0x74, 0x61, 0x64, 0x61, 0x74,
+	0x61, 0xea, 0x02, 0x21, 0x42, 0x75, 0x66, 0x3a, 0x3a, 0x56, 0x61, 0x6c, 0x69, 0x64, 0x61, 0x74,
+	0x65, 0x3a, 0x3a, 0x43, 0x6f, 0x6e, 0x66, 0x6f, 0x72, 0x6d, 0x61, 0x6e, 0x63, 0x65, 0x3a, 0x3a,
+	0x43, 0x61, 0x73, 0x65, 0x73, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
@@ -1847,7 +2148,7 @@ func file_buf_validate_conformance_cases_strings_proto_rawDescGZIP() []byte {
 	return file_buf_validate_conformance_cases_strings_proto_rawDescData
 }
 
-var file_buf_validate_conformance_cases_strings_proto_msgTypes = make([]protoimpl.MessageInfo, 35)
+var file_buf_validate_conformance_cases_strings_proto_msgTypes = make([]protoimpl.MessageInfo, 41)
 var file_buf_validate_conformance_cases_strings_proto_goTypes = []interface{}{
 	(*StringNone)(nil),                 // 0: buf.validate.conformance.cases.StringNone
 	(*StringConst)(nil),                // 1: buf.validate.conformance.cases.StringConst
@@ -1875,15 +2176,21 @@ var file_buf_validate_conformance_cases_strings_proto_goTypes = []interface{}{
 	(*StringIP)(nil),                   // 23: buf.validate.conformance.cases.StringIP
 	(*StringIPv4)(nil),                 // 24: buf.validate.conformance.cases.StringIPv4
 	(*StringIPv6)(nil),                 // 25: buf.validate.conformance.cases.StringIPv6
-	(*StringURI)(nil),                  // 26: buf.validate.conformance.cases.StringURI
-	(*StringURIRef)(nil),               // 27: buf.validate.conformance.cases.StringURIRef
-	(*StringUUID)(nil),                 // 28: buf.validate.conformance.cases.StringUUID
-	(*StringHttpHeaderName)(nil),       // 29: buf.validate.conformance.cases.StringHttpHeaderName
-	(*StringHttpHeaderValue)(nil),      // 30: buf.validate.conformance.cases.StringHttpHeaderValue
-	(*StringHttpHeaderNameLoose)(nil),  // 31: buf.validate.conformance.cases.StringHttpHeaderNameLoose
-	(*StringHttpHeaderValueLoose)(nil), // 32: buf.validate.conformance.cases.StringHttpHeaderValueLoose
-	(*StringUUIDIgnore)(nil),           // 33: buf.validate.conformance.cases.StringUUIDIgnore
-	(*StringInOneof)(nil),              // 34: buf.validate.conformance.cases.StringInOneof
+	(*StringIPWithPrefixLen)(nil),      // 26: buf.validate.conformance.cases.StringIPWithPrefixLen
+	(*StringIPv4WithPrefixLen)(nil),    // 27: buf.validate.conformance.cases.StringIPv4WithPrefixLen
+	(*StringIPv6WithPrefixLen)(nil),    // 28: buf.validate.conformance.cases.StringIPv6WithPrefixLen
+	(*StringIPPrefix)(nil),             // 29: buf.validate.conformance.cases.StringIPPrefix
+	(*StringIPv4Prefix)(nil),           // 30: buf.validate.conformance.cases.StringIPv4Prefix
+	(*StringIPv6Prefix)(nil),           // 31: buf.validate.conformance.cases.StringIPv6Prefix
+	(*StringURI)(nil),                  // 32: buf.validate.conformance.cases.StringURI
+	(*StringURIRef)(nil),               // 33: buf.validate.conformance.cases.StringURIRef
+	(*StringUUID)(nil),                 // 34: buf.validate.conformance.cases.StringUUID
+	(*StringHttpHeaderName)(nil),       // 35: buf.validate.conformance.cases.StringHttpHeaderName
+	(*StringHttpHeaderValue)(nil),      // 36: buf.validate.conformance.cases.StringHttpHeaderValue
+	(*StringHttpHeaderNameLoose)(nil),  // 37: buf.validate.conformance.cases.StringHttpHeaderNameLoose
+	(*StringHttpHeaderValueLoose)(nil), // 38: buf.validate.conformance.cases.StringHttpHeaderValueLoose
+	(*StringUUIDIgnore)(nil),           // 39: buf.validate.conformance.cases.StringUUIDIgnore
+	(*StringInOneof)(nil),              // 40: buf.validate.conformance.cases.StringInOneof
 }
 var file_buf_validate_conformance_cases_strings_proto_depIdxs = []int32{
 	0, // [0:0] is the sub-list for method output_type
@@ -2212,7 +2519,7 @@ func file_buf_validate_conformance_cases_strings_proto_init() {
 			}
 		}
 		file_buf_validate_conformance_cases_strings_proto_msgTypes[26].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*StringURI); i {
+			switch v := v.(*StringIPWithPrefixLen); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -2224,7 +2531,7 @@ func file_buf_validate_conformance_cases_strings_proto_init() {
 			}
 		}
 		file_buf_validate_conformance_cases_strings_proto_msgTypes[27].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*StringURIRef); i {
+			switch v := v.(*StringIPv4WithPrefixLen); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -2236,7 +2543,7 @@ func file_buf_validate_conformance_cases_strings_proto_init() {
 			}
 		}
 		file_buf_validate_conformance_cases_strings_proto_msgTypes[28].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*StringUUID); i {
+			switch v := v.(*StringIPv6WithPrefixLen); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -2248,7 +2555,7 @@ func file_buf_validate_conformance_cases_strings_proto_init() {
 			}
 		}
 		file_buf_validate_conformance_cases_strings_proto_msgTypes[29].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*StringHttpHeaderName); i {
+			switch v := v.(*StringIPPrefix); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -2260,7 +2567,7 @@ func file_buf_validate_conformance_cases_strings_proto_init() {
 			}
 		}
 		file_buf_validate_conformance_cases_strings_proto_msgTypes[30].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*StringHttpHeaderValue); i {
+			switch v := v.(*StringIPv4Prefix); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -2272,7 +2579,7 @@ func file_buf_validate_conformance_cases_strings_proto_init() {
 			}
 		}
 		file_buf_validate_conformance_cases_strings_proto_msgTypes[31].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*StringHttpHeaderNameLoose); i {
+			switch v := v.(*StringIPv6Prefix); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -2284,7 +2591,7 @@ func file_buf_validate_conformance_cases_strings_proto_init() {
 			}
 		}
 		file_buf_validate_conformance_cases_strings_proto_msgTypes[32].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*StringHttpHeaderValueLoose); i {
+			switch v := v.(*StringURI); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -2296,7 +2603,7 @@ func file_buf_validate_conformance_cases_strings_proto_init() {
 			}
 		}
 		file_buf_validate_conformance_cases_strings_proto_msgTypes[33].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*StringUUIDIgnore); i {
+			switch v := v.(*StringURIRef); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -2308,6 +2615,78 @@ func file_buf_validate_conformance_cases_strings_proto_init() {
 			}
 		}
 		file_buf_validate_conformance_cases_strings_proto_msgTypes[34].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*StringUUID); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_buf_validate_conformance_cases_strings_proto_msgTypes[35].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*StringHttpHeaderName); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_buf_validate_conformance_cases_strings_proto_msgTypes[36].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*StringHttpHeaderValue); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_buf_validate_conformance_cases_strings_proto_msgTypes[37].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*StringHttpHeaderNameLoose); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_buf_validate_conformance_cases_strings_proto_msgTypes[38].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*StringHttpHeaderValueLoose); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_buf_validate_conformance_cases_strings_proto_msgTypes[39].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*StringUUIDIgnore); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_buf_validate_conformance_cases_strings_proto_msgTypes[40].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*StringInOneof); i {
 			case 0:
 				return &v.state
@@ -2320,7 +2699,7 @@ func file_buf_validate_conformance_cases_strings_proto_init() {
 			}
 		}
 	}
-	file_buf_validate_conformance_cases_strings_proto_msgTypes[34].OneofWrappers = []interface{}{
+	file_buf_validate_conformance_cases_strings_proto_msgTypes[40].OneofWrappers = []interface{}{
 		(*StringInOneof_Bar)(nil),
 	}
 	type x struct{}
@@ -2329,7 +2708,7 @@ func file_buf_validate_conformance_cases_strings_proto_init() {
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_buf_validate_conformance_cases_strings_proto_rawDesc,
 			NumEnums:      0,
-			NumMessages:   35,
+			NumMessages:   41,
 			NumExtensions: 0,
 			NumServices:   0,
 		},
diff --git a/internal/gen/tests/example/v1/validations.pb.go b/internal/gen/tests/example/v1/validations.pb.go
index 8787061..4917f40 100644
--- a/internal/gen/tests/example/v1/validations.pb.go
+++ b/internal/gen/tests/example/v1/validations.pb.go
@@ -24,6 +24,7 @@ import (
 	_ "buf.build/gen/go/bufbuild/protovalidate/protocolbuffers/go/buf/validate"
 	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
 	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+	anypb "google.golang.org/protobuf/types/known/anypb"
 	apipb "google.golang.org/protobuf/types/known/apipb"
 	fieldmaskpb "google.golang.org/protobuf/types/known/fieldmaskpb"
 	reflect "reflect"
@@ -556,6 +557,100 @@ func (x *MultipleStepsTransitiveFieldConstraints) GetApi() *apipb.Api {
 	return nil
 }
 
+type Simple struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	S string `protobuf:"bytes,1,opt,name=s,proto3" json:"s,omitempty"`
+}
+
+func (x *Simple) Reset() {
+	*x = Simple{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_tests_example_v1_validations_proto_msgTypes[9]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *Simple) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*Simple) ProtoMessage() {}
+
+func (x *Simple) ProtoReflect() protoreflect.Message {
+	mi := &file_tests_example_v1_validations_proto_msgTypes[9]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use Simple.ProtoReflect.Descriptor instead.
+func (*Simple) Descriptor() ([]byte, []int) {
+	return file_tests_example_v1_validations_proto_rawDescGZIP(), []int{9}
+}
+
+func (x *Simple) GetS() string {
+	if x != nil {
+		return x.S
+	}
+	return ""
+}
+
+type FieldOfTypeAny struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Any *anypb.Any `protobuf:"bytes,1,opt,name=any,proto3" json:"any,omitempty"`
+}
+
+func (x *FieldOfTypeAny) Reset() {
+	*x = FieldOfTypeAny{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_tests_example_v1_validations_proto_msgTypes[10]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *FieldOfTypeAny) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*FieldOfTypeAny) ProtoMessage() {}
+
+func (x *FieldOfTypeAny) ProtoReflect() protoreflect.Message {
+	mi := &file_tests_example_v1_validations_proto_msgTypes[10]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use FieldOfTypeAny.ProtoReflect.Descriptor instead.
+func (*FieldOfTypeAny) Descriptor() ([]byte, []int) {
+	return file_tests_example_v1_validations_proto_rawDescGZIP(), []int{10}
+}
+
+func (x *FieldOfTypeAny) GetAny() *anypb.Any {
+	if x != nil {
+		return x.Any
+	}
+	return nil
+}
+
 var File_tests_example_v1_validations_proto protoreflect.FileDescriptor
 
 var file_tests_example_v1_validations_proto_rawDesc = []byte{
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+	0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
@@ -717,7 +823,7 @@ func file_tests_example_v1_validations_proto_rawDescGZIP() []byte {
 	return file_tests_example_v1_validations_proto_rawDescData
 }
 
-var file_tests_example_v1_validations_proto_msgTypes = make([]protoimpl.MessageInfo, 12)
+var file_tests_example_v1_validations_proto_msgTypes = make([]protoimpl.MessageInfo, 14)
 var file_tests_example_v1_validations_proto_goTypes = []interface{}{
 	(*HasMsgExprs)(nil),                             // 0: tests.example.v1.HasMsgExprs
 	(*SelfRecursive)(nil),                           // 1: tests.example.v1.SelfRecursive
@@ -728,11 +834,14 @@ var file_tests_example_v1_validations_proto_goTypes = []interface{}{
 	(*MsgHasMap)(nil),                               // 6: tests.example.v1.MsgHasMap
 	(*TransitiveFieldConstraint)(nil),               // 7: tests.example.v1.TransitiveFieldConstraint
 	(*MultipleStepsTransitiveFieldConstraints)(nil), // 8: tests.example.v1.MultipleStepsTransitiveFieldConstraints
-	nil,                           // 9: tests.example.v1.MsgHasMap.Int32mapEntry
-	nil,                           // 10: tests.example.v1.MsgHasMap.StringMapEntry
-	nil,                           // 11: tests.example.v1.MsgHasMap.MessageMapEntry
-	(*fieldmaskpb.FieldMask)(nil), // 12: google.protobuf.FieldMask
-	(*apipb.Api)(nil),             // 13: google.protobuf.Api
+	(*Simple)(nil),                                  // 9: tests.example.v1.Simple
+	(*FieldOfTypeAny)(nil),                          // 10: tests.example.v1.FieldOfTypeAny
+	nil,                                             // 11: tests.example.v1.MsgHasMap.Int32mapEntry
+	nil,                                             // 12: tests.example.v1.MsgHasMap.StringMapEntry
+	nil,                                             // 13: tests.example.v1.MsgHasMap.MessageMapEntry
+	(*fieldmaskpb.FieldMask)(nil),                   // 14: google.protobuf.FieldMask
+	(*apipb.Api)(nil),                               // 15: google.protobuf.Api
+	(*anypb.Any)(nil),                               // 16: google.protobuf.Any
 }
 var file_tests_example_v1_validations_proto_depIdxs = []int32{
 	1,  // 0: tests.example.v1.SelfRecursive.turtle:type_name -> tests.example.v1.SelfRecursive
@@ -740,17 +849,18 @@ var file_tests_example_v1_validations_proto_depIdxs = []int32{
 	2,  // 2: tests.example.v1.LoopRecursiveB.a:type_name -> tests.example.v1.LoopRecursiveA
 	0,  // 3: tests.example.v1.MsgHasOneof.msg:type_name -> tests.example.v1.HasMsgExprs
 	0,  // 4: tests.example.v1.MsgHasRepeated.z:type_name -> tests.example.v1.HasMsgExprs
-	9,  // 5: tests.example.v1.MsgHasMap.int32map:type_name -> tests.example.v1.MsgHasMap.Int32mapEntry
-	10, // 6: tests.example.v1.MsgHasMap.string_map:type_name -> tests.example.v1.MsgHasMap.StringMapEntry
-	11, // 7: tests.example.v1.MsgHasMap.message_map:type_name -> tests.example.v1.MsgHasMap.MessageMapEntry
-	12, // 8: tests.example.v1.TransitiveFieldConstraint.mask:type_name -> google.protobuf.FieldMask
-	13, // 9: tests.example.v1.MultipleStepsTransitiveFieldConstraints.api:type_name -> google.protobuf.Api
-	2,  // 10: tests.example.v1.MsgHasMap.MessageMapEntry.value:type_name -> tests.example.v1.LoopRecursiveA
-	11, // [11:11] is the sub-list for method output_type
-	11, // [11:11] is the sub-list for method input_type
-	11, // [11:11] is the sub-list for extension type_name
-	11, // [11:11] is the sub-list for extension extendee
-	0,  // [0:11] is the sub-list for field type_name
+	11, // 5: tests.example.v1.MsgHasMap.int32map:type_name -> tests.example.v1.MsgHasMap.Int32mapEntry
+	12, // 6: tests.example.v1.MsgHasMap.string_map:type_name -> tests.example.v1.MsgHasMap.StringMapEntry
+	13, // 7: tests.example.v1.MsgHasMap.message_map:type_name -> tests.example.v1.MsgHasMap.MessageMapEntry
+	14, // 8: tests.example.v1.TransitiveFieldConstraint.mask:type_name -> google.protobuf.FieldMask
+	15, // 9: tests.example.v1.MultipleStepsTransitiveFieldConstraints.api:type_name -> google.protobuf.Api
+	16, // 10: tests.example.v1.FieldOfTypeAny.any:type_name -> google.protobuf.Any
+	2,  // 11: tests.example.v1.MsgHasMap.MessageMapEntry.value:type_name -> tests.example.v1.LoopRecursiveA
+	12, // [12:12] is the sub-list for method output_type
+	12, // [12:12] is the sub-list for method input_type
+	12, // [12:12] is the sub-list for extension type_name
+	12, // [12:12] is the sub-list for extension extendee
+	0,  // [0:12] is the sub-list for field type_name
 }
 
 func init() { file_tests_example_v1_validations_proto_init() }
@@ -867,6 +977,30 @@ func file_tests_example_v1_validations_proto_init() {
 				return nil
 			}
 		}
+		file_tests_example_v1_validations_proto_msgTypes[9].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*Simple); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_tests_example_v1_validations_proto_msgTypes[10].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*FieldOfTypeAny); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
 	}
 	file_tests_example_v1_validations_proto_msgTypes[4].OneofWrappers = []interface{}{
 		(*MsgHasOneof_X)(nil),
@@ -879,7 +1013,7 @@ func file_tests_example_v1_validations_proto_init() {
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_tests_example_v1_validations_proto_rawDesc,
 			NumEnums:      0,
-			NumMessages:   12,
+			NumMessages:   14,
 			NumExtensions: 0,
 			NumServices:   0,
 		},
diff --git a/proto/buf.lock b/proto/buf.lock
index 88097ab..06467a2 100644
--- a/proto/buf.lock
+++ b/proto/buf.lock
@@ -4,13 +4,13 @@ deps:
   - remote: buf.build
     owner: bufbuild
     repository: protovalidate
-    commit: 63dfe56cc2c44cffa4815366ba7a99c0
-    digest: shake256:5a8a9856b92bf37171d45ccbe59fc48ea755cd682317b088cdf93e8e797ecf54039e012ece9a17084bb676e70c2e090296b2790782ebdbbedc7514e9b543e6bf
+    commit: 12f9cba37c9d49eeb6827dde227d6031
+    digest: shake256:a9470135a1736bdb74396e35342b4431b0bf3a5e7a2198fb77f49be46af744aae134f8e0593683216e836f1f0a551ccf86a9f8857c6829b8d33f4b604602a5ff
   - remote: buf.build
     owner: bufbuild
     repository: protovalidate-testing
-    commit: 1e7219041805401e8ae8d804205a63ba
-    digest: shake256:1256ad54637d755f9ab681017a279137e1ea314cafcfaac92a6eddd2ac564e082bdb40da243d29e585a3491350f3dd7180a21c9c5ab31a88817aa495e2c828b9
+    commit: cc79bc8bf62b492d9a8305c400143fe9
+    digest: shake256:3f1d2c20783f84518ec7226c59fbbe50e585be084eb855d5d01bd4fa0b22fe8011352919288f1eb5325607a0cf9bb72b94b11007eb065a6d21c81831e4bce2da
   - remote: buf.build
     owner: envoyproxy
     repository: protoc-gen-validate
diff --git a/proto/tests/example/v1/validations.proto b/proto/tests/example/v1/validations.proto
index 8248e65..f5b7307 100644
--- a/proto/tests/example/v1/validations.proto
+++ b/proto/tests/example/v1/validations.proto
@@ -17,6 +17,7 @@ syntax = "proto3";
 package tests.example.v1;
 
 import "buf/validate/validate.proto";
+import "google/protobuf/any.proto";
 import "google/protobuf/api.proto";
 import "google/protobuf/field_mask.proto";
 
@@ -140,3 +141,15 @@ message MultipleStepsTransitiveFieldConstraints {
     expression: "has(this.source_context.file_name)"
   }];
 }
+
+message Simple {
+  string s = 1;
+}
+
+message FieldOfTypeAny {
+  google.protobuf.Any any = 1 [(buf.validate.field).cel = {
+    id: "any_type",
+    message: "this should never fail",
+    expression: "this == this"
+  }];
+}
diff --git a/validator_test.go b/validator_test.go
index cd5d1ec..d2aeff9 100644
--- a/validator_test.go
+++ b/validator_test.go
@@ -20,6 +20,7 @@ import (
 	pb "github.com/bufbuild/protovalidate-go/internal/gen/tests/example/v1"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
+	"google.golang.org/protobuf/types/known/anypb"
 	"google.golang.org/protobuf/types/known/apipb"
 	"google.golang.org/protobuf/types/known/fieldmaskpb"
 	"google.golang.org/protobuf/types/known/sourcecontextpb"
@@ -152,3 +153,17 @@ func TestValidator_Validate_MultipleStepsTransitiveFieldConstraints(t *testing.T
 	err = val.Validate(msg)
 	require.NoError(t, err)
 }
+
+func TestValidator_Validate_FieldOfTypeAny(t *testing.T) {
+	t.Parallel()
+	val, err := New()
+	require.NoError(t, err)
+	simple := &pb.Simple{S: "foo"}
+	anyFromSimple, err := anypb.New(simple)
+	require.NoError(t, err)
+	msg := &pb.FieldOfTypeAny{
+		Any: anyFromSimple,
+	}
+	err = val.Validate(msg)
+	require.NoError(t, err)
+}