Free web service to determine IP address zip code [closed]

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Does anyone know of a free web service to determine the zip code of an IP address?

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MaxMind GeoLite City

http://www.maxmind.com/app/geolitecity

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I realize this question is old, but this may still help other people. I found a free / open source (so you can even run your own instance and not be subject to their hourly limit of 10,000 requests) IP geolocation database: http://freegeoip.net/

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I don't know of any that will return a zipcode, but this one is free and returns city/state

http://www.hostip.info/

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http://tuq.in/tools/geo

is a free geolocation service also it is way awsome in quality