There’s a terrific open source product offered by MaxMind called GeoLite City that is a binary (or CSV) database for doing IP location lookups. There are many flavors of the GeoIP API that provide optimized access to the .DAT file, including C# and VB.Net (Country only). The C# version is a collection of 5 classes and is very easy to use:
Dim ls As New LookupService("C:\GeoIP\GeoLiteCity.dat")
Dim IPLoc As Location = ls.getLocation(IPString)
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