W3b0s1nt (WebOSINT) is a Python tool/script for passive Domain Intelligence gathering.

SubEvil is an advanced open source intelligence framework (OSINT) for grouping subdomains.

A simple utility to perform reverse WHOIS lookups using whoisxml API

WHOIS, DNS, ping, view source, and more!

Whois API client library for Python

Code samples of querying the API services of Whois XML Api.

Code samples of querying the Whois API service of Whois XML Api.

The best possible way to verify and validate an email address.

The best possible way to verify and validate an email address in Python.

Code samples of querying the Bulk Whois API service of Whois XML API

The simplest possible way to get IP geolocation information.

Domain, IPv4 + IPv6 WhoIS for realms and network nodes (Who owns you?)

Reverse IP/DNS API client library for Python

The best possible way to verify and validate an email address in PHP.

Code samples of querying the Domain Availability API service of Whois XML Api.

Code samples of querying the Registrant Alert API service of Whois XML Api.

Subdomainhound - Discover domains and subdomains through subsidiaries.

The easiest way to verify emails in your Flask application.

Whois DNS Records, creates ARM Template output

Whois API client library for Java