Need help with PHP script for IP address of sites

[jeetesting]

Need help with PHP script for IP address of sites

Hi All
I need some assistance with getting the IP address of a web site.

Basically I have to write a PHP page where if a site name is supplied it would return back the IP address of the site as well as specify if the IP Address is Dedicated for that site or a Shared IP Address

I have figured out how to get the IP address of a site in PHP however I am not able to figure out how can I find out whether that IP address is static i.e. dedicated IP for the site or a shared IP that the site is using.

Does anyone know how to get around this problem, using PHP how can I figure out if an IP address of the site is a Dedicated IP address for that site or whether that IP is a shared one.

Any help on this matter is appreciated

Cheers
Asif

[SirDice]

I have figured out how to get the IP address of a site in PHP however I am not able to figure out how can I find out whether that IP address is static i.e. dedicated IP for the site or a shared IP that the site is using.

AFAIK there's no way to figure that out remotely.

[nihil]

I don't know if this helps but if you type an IP address into your browser's address bar and only that site comes up, then it is dedicated. If more than one comes up then it is shared.

[SirDice]

If more than one comes up then it is shared.

How can more sites come up? If the site uses virtual hosts (multiple websites on 1 ip) it will just show the default.

[nihil]

Sorry SD, I was a bit obtuse with that post.

If you get a default it won't be the site that you were expecting, so that tells you it is a shared IP?

As far as I know you cannot find who or how many shares there are, just that there is a share.

[skiddieleet]

http://us3.php.net/manual/en/functio...ostbynamel.php

That will at least get you one or more IPs of the site, but I don't know how you would tell if one IP is hosting multiple sites.

[oofki]

I will show you!

So for example take a look at my site (oofki.net) it resolves to 74.208.29.120
If you goto the ip directly it says page cannot be found - it is shared

Now take a look at antionline.com it resolves to 63.146.109.212
If you goto the ip directly it goes to this page! - it is dedicated :-)

[SirDice]

So for example take a look at my site (oofki.net) it resolves to 74.208.29.120
If you goto the ip directly it says page cannot be found - it is shared

Which means you haven't set it up properly..

Now take a look at antionline.com it resolves to 63.146.109.212
If you goto the ip directly it goes to this page! - it is dedicated :-)

Or AO is the default site..

Don't get me wrong, I'm just showing you that this isn't a good way to check

[HTRegz]

Time for a bit of WebServer 101

SirDice is 100% correct... so for those that don't understand.. here's how it works.

When you request a webpage (typing a domain name or IP in your browser's address bar)... A request is generated that looks similar to the following (we'll use antionline.com as our example).

GET / HTTP/1.1
HOST: antionline.com

Of course your browser puts plenty of other stuff in there, but that's basic enough to work.

Web Servers (with a few exceptions) can host multiple websites, configured by hostname, ip, etc. The most common (as in the case of purchased web hosting) is by hostname using Virtual Hosts. In this case the site has a default configured site, and then multiple virtual sites. Depending on the setup that default site could be a valid page or a standard server configuration page. Since your browser simply resolves the domain name you provide and connects to the IP Address that it resolves to, it needs a way to specify which virtual host it is looking for. The HOST: header allows this to happen. It is also a requirement in HTTP/1.1.

The concept that oofki / nihil suggested is flawed... here's an example:

74.208.75.235 -- Displays: It Works!
www.securitysentience.com -- Displays: It Works!

However that sites also hosts:
www.killthesun.org
www.numerophobe.com
Along with a couple of others.

[brokencrow]

Which means you haven't set it up properly...

Oofki didn't set that host up. He uses 1and1.com, probably the Linux
plan. Know them well. They run a tight ship, actually. I think the 404
page is default.