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Google Analytics can give you this data in the reports but won't allow you to get access to it in real time in your application.

Imagine you want to redirect users to the correct country page in your site. In this case you need to get access to the ip geolocation in real time. GA won't help you there.

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If your goal is geo-redirection then a 3rd party service is usually a bad choice (speed + downtime). An memory geo-ip database is the best way to go - but this is usually also part of what you pay for when you buy the non-free version

Maxmind have a free database (GeoLite2) that's updated weekly. Here's an overview of the accuracy per country:

http://www.maxmind.com/en/geolite_city_accuracy

It's less accurate than their commercial offering, but good enough in many cases. For ease of use, there's a nice C API (https://github.com/maxmind/geoip-api-c) and wrappers like pygeoip for Python.

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