Unique IPs: How Did They Do It?

There was a website which was conducting a test by generating unqiue IP addresses.  One thing I've always heard about the net is that IP addresses are unique for each person.  

How did they generate a unique IP address for each test they conducted?  Oh, the test was testing out those many CGI tracking programs for legitamacy.  Does the secret lie in programs such as LINKLINT or URLGET?

Are there any GREAT books which can teach me more about the underlying workings of the Internet, TCP/IP, etc.  I would love to understand LINKLINT and URLGET better.  A fetsih of mine.

Thanks.
ratboyAsked:
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ahoffmannConnect With a Mentor Commented:
About unique IPs:

 they are maintained by the InterNIC http://rs.internic.net/
 InterNIC serves the mapping of IP address to domain name.

 If someone gives you a unique IP, (s)he got a pool of IPs
 from InterNIC (ussually a class A, B or C net).

Books:
  TCP/IP Network Administration, O,Reilly&Associates

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