Given direct access to a GPS, you could optimize the lookup for 127.0.0.1.

Seriously, though, since a substantial chunk of the IP addresses one typically sees in a server log are dynamically allocated (e.g., via @home or pacbell.net), or are funnelled via NAT through a single IP address that may be far distant from the source, the latitude and longitude this produces should be considered to be "for amusement purposes only".

In reply to Re: Getting longitude and latitude from an IP address by dws
in thread Getting longitude and latitude from an IP address by Kickstart

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