network host tools

whois

1. http://www.whoismind.com/whois/domainname.com.html

Reverse ip lookup

1. http://www.domaintools.com/reverse-ip/
2. http://www.myipneighbors.com/
3. http://www.yougetsignal.com/tools/web-sites-on-web-server/
4. http://whois.webhosting.info/