diff --git a/src/Symfony/Component/HttpFoundation/IpUtils.php b/src/Symfony/Component/HttpFoundation/IpUtils.php
index 3bb33140f5055..86d135b2d3afd 100644
--- a/src/Symfony/Component/HttpFoundation/IpUtils.php
+++ b/src/Symfony/Component/HttpFoundation/IpUtils.php
@@ -123,6 +123,10 @@ public static function checkIp6($requestIp, $ip)
         if (false !== strpos($ip, '/')) {
             list($address, $netmask) = explode('/', $ip, 2);
 
+            if ('0' === $netmask) {
+                return (bool) unpack('n*', @inet_pton($address));
+            }
+
             if ($netmask < 1 || $netmask > 128) {
                 return self::$checkedIps[$cacheKey] = false;
             }
diff --git a/src/Symfony/Component/HttpFoundation/Tests/IpUtilsTest.php b/src/Symfony/Component/HttpFoundation/Tests/IpUtilsTest.php
index 54cbb5c20672d..7a93f9947262d 100644
--- a/src/Symfony/Component/HttpFoundation/Tests/IpUtilsTest.php
+++ b/src/Symfony/Component/HttpFoundation/Tests/IpUtilsTest.php
@@ -62,6 +62,8 @@ public function getIpv6Data()
             array(false, '2a01:198:603:0:396e:4789:8e99:890f', '::1'),
             array(true, '0:0:0:0:0:0:0:1', '::1'),
             array(false, '0:0:603:0:396e:4789:8e99:0001', '::1'),
+            array(true, '0:0:603:0:396e:4789:8e99:0001', '::/0'),
+            array(true, '0:0:603:0:396e:4789:8e99:0001', '2a01:198:603:0::/0'),
             array(true, '2a01:198:603:0:396e:4789:8e99:890f', array('::1', '2a01:198:603:0::/65')),
             array(true, '2a01:198:603:0:396e:4789:8e99:890f', array('2a01:198:603:0::/65', '::1')),
             array(false, '2a01:198:603:0:396e:4789:8e99:890f', array('::1', '1a01:198:603:0::/65')),