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.htmlhttp://www.tracert.com/Handy tools: traceroute, ping, nslookup, whois, dig