Whoisology - Connected database of whois records and whois history
IP-Toolbox.com - IP-Toolbox.com is the best site for quick and easy viewing of your public IP address and other related information.
WhoisThisDomain - Domain name lookup tool that allows you to get information about domain registration from WHOIS server.
What is My IP Live - Find your IPv4 and IPv6 just by visiting whatismyip.live - complete IP geolocation is also provided along with some other useful IP tools.
Bulk Whois API - Bulk Whois API is a provider of parsed WHOIS data in JSON with simple API, competitive pricing, top notch support, and more.
whatismyip.cc - External IP Address lookup tool with option to scan the external IP address.