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开发者_如何学Go Improve this questionDoes anyone know of a free web service to determine the zip code of an IP address?
MaxMind GeoLite City
http://www.maxmind.com/app/geolitecity
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/
I don't know of any that will return a zipcode, but this one is free and returns city/state
http://www.hostip.info/
http://tuq.in/tools/geo
is a free geolocation service also it is way awsome in quality
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