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copied!<p>There are two approaches: using an Internet service and using some kind of local list (perhaps wrapped in a library). What you want will depend on what you are building.</p> <p>For services:</p> <ul> <li><a href="http://www.hostip.info/use.html" rel="nofollow noreferrer">http://www.hostip.info/use.html</a> (as mentioned by <a href="https://stackoverflow.com/questions/1033/ip-to-country#1034">Mark</a>)</li> <li><a href="http://www.team-cymru.org/Services/ip-to-asn.html" rel="nofollow noreferrer">http://www.team-cymru.org/Services/ip-to-asn.html</a></li> </ul> <p>For lists:</p> <ul> <li><a href="http://www.maxmind.com/app/geoip_country" rel="nofollow noreferrer">http://www.maxmind.com/app/geoip_country</a> (as mentioned by <a href="https://stackoverflow.com/questions/1033/ip-to-country#1056">Orion</a>)</li> <li><p>You could roll your own by downloading the lists from the RIRs:</p> <ul> <li><a href="ftp://ftp.arin.net/pub/stats/arin/delegated-arin-latest" rel="nofollow noreferrer">ftp.arin.net/pub/stats/arin/delegated-arin-latest</a></li> <li><a href="ftp://ftp.ripe.net/ripe/stats/delegated-ripencc-latest" rel="nofollow noreferrer">ftp.ripe.net/ripe/stats/delegated-ripencc-latest</a></li> <li><a href="ftp://ftp.afrinic.net/pub/stats/afrinic/delegated-afrinic-latest" rel="nofollow noreferrer">ftp.afrinic.net/pub/stats/afrinic/delegated-afrinic-latest</a></li> <li><a href="ftp://ftp.apnic.net/pub/stats/apnic/delegated-apnic-latest" rel="nofollow noreferrer">ftp.apnic.net/pub/stats/apnic/delegated-apnic-latest</a></li> <li><p><a href="ftp://ftp.lacnic.net/pub/stats/lacnic/delegated-lacnic-latest" rel="nofollow noreferrer">ftp.lacnic.net/pub/stats/lacnic/delegated-lacnic-latest</a></p> <p>The format is documented <a href="ftp://ftp.arin.net/pub/stats/arin/README" rel="nofollow noreferrer">in this README</a></p></li> </ul></li> </ul>

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