www.who.is

         who.is is the web’s premier choice when it comes to performing a WHOIS lookup on domain names. Since 2005, it offered unique IP tools to look up IP addresses on thousands of top-level domains (TLDs) and second-level domains (SLDs). Its WHOIS tool provides valuable domain information such as domain registrar, status, expiration date, and DNS name servers.

          Use who.is site to quickly locate administrative and technical contact information for the owner of any domain name. Its domain name WHOIS results also include IP and IP location information, web server information, related domain availability, premium domain listings and more.

Link: http://www.who.is/

www.knowmyip.com

          Your IP (Internet Protocol) address is used to identify your computer on a network. It's a way computers recognize each other. Your IP address can change. Sometimes often. It depends on your Internet Service Provider and the type of service you have with them.

          Some programs and forms require you to enter your IP address. Sometimes you want to know your hostname.

          When you need to know your IP or host name, you come to knowmyip.com and it will instantly show you what IP you are connected to the internet with.

Link: http://www.knowmyip.com/