what is the PHP syntax to compare an IP address string with a filter in order to know if the address is in specified subnetwork...

I need to know if a visitor IP is part of a specific subnetwork, so I have to test that the string is in the format "192.168.101.x".

...and also a way to filter a B class address "192.168.x.x"

you can use ereg function this way:

<? //check if the IP address is in the form 192.168.x.x if (ereg("^192.168.[0-9]{1,3}.[0-9]{1,3}",$IPToCheck) echo "match" //check if the IP address is in the form 192.168.101.x if (ereg("^192.168.101.[0-9]{1,3}",$IPToCheck) echo "match" ?>

hope this helps

[Edited by admin on 16-11-2005 at 06:23 PM GMT]

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AndreaVB