[thelist] PHP: getting domain names from a url - being foiled by .co.uk addresses

[Paul Bennett]

Tony Crockford wrote:

> On Sat, 06 Dec 2003 13:21:46 -0700, Ken Moore <psm2713 at hotmail.com> 
> wrote:
>
>>
>> Not so tricky at all. Assuming that there are a set number of 
>> top-level domains (com, gov, net) and that there is a set number of 
>> characters (".", I think is the only one) that begin the TL name, do 
>> a string processing routine that looks for the "." and the TL domain 
>> such as "com". Take those four characters and all of the ones back to 
>> the "."
>
> ...
> couldn't you do a DNS look up and store the IP address instead?
>
> http://uk.php.net/manual/en/function.gethostbyname.php 

just a warning - reverse dns can be s..l..o..w when working through a 
large list of ip's
we had some simple ip-> domain resolving from a db log and it took up to 
7 minutes to chew through the ip's

>
>
> Maybe?



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	Paul Bennett						
	Internet Developer				
	Teltest Electronic Design		
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