Best bet is probably to use CAIDA's Netgeo:
http://www.caida.org/tools/utilities/netgeo/
It can give some squirely answers, and is not actively maintained, but good stuff for being free
Best bet is probably to use CAIDA's Netgeo:
http://www.caida.org/tools/utilities/netgeo/
It can give some squirely answers, and is not actively maintained, but good stuff for being free