Re: reverse lookup/domain lookup in PHP

> Is it possible to reverse lookup (like here http://www.whatismyipaddress.com/reverse.asp) to find the domain with PHP? I assume a DNS lookup requires an external server somewhere? > you can use exec or similar and to a reverse lookup like that... a traceroute should cover it. please don't copy and paste my code, just giving you an idea of what you'll do... exec("traceroute ".$ip." > file.tmp") then read the contents of file.tmp and you should be able to get the whole of the traceroute. this brings up certain issues with speed of a traceroute and run times of a script. also there may be a better way of doing this other than piping the contents into a temporary file, but i've had issues with reading what exec() outputs before (or whatever system call function you'd like to use) ... hope this helps a little