Internet IP addys distribution is a big big mess.
It never had been geographically distributed. Coze IP ranges had been given to companies or gov or whatever in a FIFO style.

That's the reason why if you look at the routing table of a provider router connected to the www you'll see a damn huge list of ip addys (the file is about 40Mb, just for listing addys in string format..... wooo).

In an ideal world, and I sincerely hope with IPv6, ip ranges will be betterly distributed, in a manner where address aggregation would be achievable.