Whoisology - Connected database of whois records and whois history
Domain Details - Displays Server Type, Headers, IP Address, Location Flag, and links to Whois Reports.
WhoisThisDomain - Domain name lookup tool that allows you to get information about domain registration from WHOIS server.
Online Domain Tools - Online-Domain-Tools.com makes your online life easier and happier.
JSON WHOIS API - Parsed domain WHOIS data from any WHOIS server via RESTful API with metered pay as you pricing.
IP Map - See your IP address and the IP address of the website you are visiting on a map.