geotools

IP to Country/Region lookup module

node-geo

nodejs geo lookup module

You can download fresh geo database from this website: http://ipgeobase.ru/. Database contains major ranges for all countries worldwide and presice ranges for most Russian cities/regions. Also it could be extended with another geo data.

var geo = require('node-geo');
var res = geo.lookup("87.229.134.24");

Approximate speed on average laptop is about 1.5M calls per second. Benchmark is simple, but it gives you an idea about module's performance. Test it yourself:

node ./lib/bench.js