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Important URLs
http://www.networksolutions.com/whois/index.jhtml
The original InterNIC. This site has the “whois” database
http://www.arin.net
American registry for Internet numbers. This site has a “whois” database for IP numbers
http://www.net.princeton.edu/traceroute.html
http://www.tracert.com/
Handy tools: traceroute, ping, nslookup, whois, dig