#geocode
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How To Make An IP-To-Country Tool With PHP and MySQL
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Geonames: Postal Codes
Free (CC Attribution licence) web service for postcode lookups. Lat/Lng results in JSON.Categories
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Hungry Machine Blog: Super fast IP to lat/lng in Rails
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Calculating Distance in Miles from Latitude and Longitude
Uses Google’s GeoCoding API and some simple maths in SQLCategories