Whoisology - Connected database of whois records and whois history
My Public IP - My Public IP is a utility to let you know through which internet IP the world see you.
WhoisThisDomain - Domain name lookup tool that allows you to get information about domain registration from WHOIS server.
What is my IP? - Find out what your IP is. Do not hesitate to open wimip.
JSON WHOIS API - Parsed domain WHOIS data from any WHOIS server via RESTful API with metered pay as you pricing.
TrueIP - TrueIP is a small program that runs in the system tray, monitoring your IP address(es).