The Maxmind GeoIP API is now available as a TCL extension

  * http://www.maxmind.com/app/tcl

 # geoip example

 package require geoip

 geoip open -type isp   ;# open the ISP database (error if not installed)

 puts "country = [geoip country_code_by_name wiki.tcl.tk]"
 puts "isp     = [geoip name_by_name wiki.tcl.tk]"

This generates (as of July 2006):

 country = DE
 isp     = IPX Server GmbH