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Fastest way of getting a domain’s IP?

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Mar 09.2007

Hi

I have this in a function:

[code=php]
$hosts = gethostbynamel($domain);
if (is_array($hosts)) {
$IP = $hosts[0];
}
[/code]

I’m fetching about 2 million $domain from a database and want to get the ip of the domain. Sometimes the domain is just garbage for example “yhujgga”, or even a IP-address.

The gethostbynamel() seems to take a while sometimes, as I guess a dns-lookup (it is a dns-lookup?) would do. Are there any faster ways of getting the ip of a domain (well, a domain in most cases, sometimes just garbage)? Naturally the above would take a while on 2 million domain names, and I really would like to speed it up…

Thanks
Lubox

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PHP

2 Comments(s) ↴

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@LuboxauthorMar 13.2007 — Ok, let me try to ask it a little bit different:

Any way of getting the IP address of a domain name which let me add a timeout value (not PHP set_time_limit)? Maybe something with fsockopen, or?

The problem is that some of the gethostbynamel() seems to take really long time once in a while, and it would help if I could add a timeout of for example 5 seconds or something, and then continue my script..

Any suggestions?

Thanks

Lubox
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@bokehMar 13.2007 — You would need to open a socket in non blocking mode. Alternatively use the PEAR dns class and set a timeout. In theory the DNS should deal with this issue but you need to remember DNS lookups take time. Sometimes it even takes several seconds just to raise a root server. Try running a few domains through my DNS checker in my signature and you will see what I mean.
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