reverse lookup/domain lookup in PHP

From: Date: Thu, 11 Sep 2003 09:56:56 +0000
Subject: reverse lookup/domain lookup in PHP
Groups: php.general 
Request: Send a blank email to php-general+get-162262@lists.php.net to get a copy of this message
I've got some code doing IP checking using the HTTP header...but would like to improve it.... 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? Sounds weird I know but I want to also block a specific domain rather than a range of IPs (as IP addresses can and do change...) and wondering how/if this was possible? thanks Tim

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