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Home > Archive > Apache Server configuration support > July 2006 > Virtual Hosts
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| rainnyjazz@hotmail.com 2006-07-26, 1:29 pm |
| Hi people, first of all sorry for my english.
I have one question, is it possible to know how many hosts are behind
one IP? Their names too.
For example, the IP xxx.xxx.xxx.xxx belongs to one ISP, which has set
up X amount of virtual hosts. Is it possible to know how many are they?
And their names?
I tried with dig command in Linux .. and reverse DNS look up .. but
they don't work with virtual hosts.
thanks in advance!
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| Davide Bianchi 2006-07-26, 7:33 pm |
| On 2006-07-26, rainnyjazz@hotmail.com <rainnyjazz@hotmail.com> wrote:
> I have one question, is it possible to know how many hosts are behind
> one IP?
Basically no.
Davide
--
C makes it easy to shoot yourself in the foot, C++ makes it a little
harder, but when you do, it blows away your whole leg.
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| rainnyjazz@hotmail.com 2006-07-26, 7:33 pm |
| Davide Bianchi ha escrito:
> On 2006-07-26, rainnyjazz@hotmail.com <rainnyjazz@hotmail.com> wrote:
>
> Basically no.
> Davide
Well, I tried this site : http://www.webhosting.info/domains/
It works for some IPs but it doesn't for others.
Anybody has any idea of how the script of this site works?
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| Jim Carlock 2006-07-27, 7:31 am |
| Davide Bianchi ha escrito:
> On 2006-07-26, rainnyjazz@hotmail.com <rainnyjazz@hotmail.com> wrote:
>
> Basically no.
> Davide
<rainnyjazz@hotmail.com> wrote:
> Well, I tried this site : http://www.webhosting.info/domains/
>
> It works for some IPs but it doesn't for others.
>
> Anybody has any idea of how the script of this site works?
It sends out a spider ? There's two ways to work this and to
get truely accurate results you'd have to work it both ways.
(1) Walk through every IP address and get a DNS lookup.
(2) Walk through every link listed in every newsgroup and
start crawling through them all.
The first way may or may not return anything useful. The
second way is the way Google and Yahoo work it. Then,
of course you'd need a database to hold the information.
Hope this helps.
--
Jim Carlock
Post replies to the group.
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| rainnyjazz@hotmail.com 2006-07-27, 7:31 am |
|
Jim Carlock ha escrito:
> Davide Bianchi ha escrito:
>
>
> <rainnyjazz@hotmail.com> wrote:
>
> It sends out a spider ? There's two ways to work this and to
> get truely accurate results you'd have to work it both ways.
>
> (1) Walk through every IP address and get a DNS lookup.
> (2) Walk through every link listed in every newsgroup and
> start crawling through them all.
>
> The first way may or may not return anything useful. The
> second way is the way Google and Yahoo work it. Then,
> of course you'd need a database to hold the information.
>
> Hope this helps.
>
> --
> Jim Carlock
> Post replies to the group.
Thanks a lot Jim and Davide. It really helps!
I've been working with both models Jim says.
The problem with 2) is that a spider can't find a host that is not
linked by other site.
Then you can apply 1) only walking IPs that are not consider by 2) .
But when you get a dns lookup of an IP which is behind a virtual host,
there's no way to resolve all the hosts names behind that IP, this is
right? It is what Davide says.
Thanks again.
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| On Wed, 26 Jul 2006 10:12:18 -0700, rainnyjazz wrote:
> Hi people, first of all sorry for my english.
>
> I have one question, is it possible to know how many hosts are behind
> one IP? Their names too.
> For example, the IP xxx.xxx.xxx.xxx belongs to one ISP, which has set
> up X amount of virtual hosts. Is it possible to know how many are they?
> And their names?
> I tried with dig command in Linux .. and reverse DNS look up .. but
> they don't work with virtual hosts.
> thanks in advance!
httpd -S
but you have to be on the server to run it. Otherwise, no. Wildcard dns
will ensure that you can never be sure, either.
For example, I just throw another one up when developing a new customer
site.
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