i did this once
$ip = sprintf("%u",intval(ip2long($_SERVER['REMOTE_ADDR'])));
and then did checks to see if it was between the ranges for 10.0.0.0,
192.168 etc...
apparently i lost that code. but it was pretty simple.
http://www.faqs.org/rfcs/rfc1918.html
10.0.0.0 - 10.255.255.255 (10/8 prefix)
172.16.0.0 - 172.31.255.255 (172.16/12 prefix)
192.168.0.0 - 192.168.255.255 (192.168/16 prefix)
and then what, 224.0.0.0-255.255.255.255? and not 0.0.0.0.
i had it all figured out... just print out what the 10.0.0.0 is in
integer, and 10.255.255.255 and such, and then just check if the
integer is between any of the "invalid" ranges. the integer math
should be very fast.
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