Source: http://xkcd.com/c195.html – I’m sure they took the data from IANA. But the fractal idea makes total sense. Still, I wished that there were some cool class B addresses being shown. CMU is 128.2.x.x, SCS’s IDC is 192.245.x.x etc.
Lots of toys can be found on one of my favourite DNS website: www.dnsstuff.com. The authority of the above information can be found here: www.internic.net. Try searching my IP address (will post to http://www.internic.net/whois.html) by just clicking Submit (or try yours).