Re: reverse DNS lookup with PHP

On Sat, 2003-06-14 at 14:38, Tom Ray [Lists] wrote: > $_SERVER[REMOTE_HOST]; > > This will do a reverse lookup on their IP. > > Manual Link: > > http://ca3.php.net/manual/en/reserved.variables.php#reserved.variables.server Actually, this isn't true. $_SERVER['REMOTE_HOST'] will contain the hostname of the client if and only if the web server has placed that value there. Simply referring to the variable does not cause a lookup to be done. To do the lookup yourself, use gethostbyaddr(): http://www.php.net/gethostbyaddr Hope this clarifies it a bit, Torben > Hope it helps > > Tim Thorburn wrote: > > > Hi, > > > > I'm setting up a simple tracking program for a website I'm working > > on. Currently it records a visitors IP address, but I would like to > > be able to do a DNS lookup of these IP addresses. Is this possible > > with PHP and if so, how is it done? I've been looking through Google, > > and the very few real results I've come across are large perl programs > > which make little to no sense to me. > > > > Any help would be greatly appreciated. > > > > Thanks > > -Tim -- Torben Wilson <torben@php.net> +1.604.709.0506 http://www.thebuttlesschaps.com http://www.inflatableeye.com http://www.hybrid17.com http://www.themainonmain.com -----==== Boycott Starbucks! http://www.haidabuckscafe.com ====-----