The Maxmind GeoIP API is now available as a TCL extension

You can download it from http://www.maxmind.com/app/tcl.  
You need to have the C API built and installed (as well as the necessary database files) 
before you can use it.

Here's a simple 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
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[Basic GeoIP with Tcl]

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[Category Geography]