--- Paul M Foster <paulf@quillandmouse.com> wrote:
> Richard Morgan wrote:
> > Quoting Paul M Foster <paulf@quillandmouse.com>:
> >
> >> Richard Morgan wrote:
> >>
> >> > Quoting Paul M Foster
> <paulf@quillandmouse.com>:
> >> >
> >> >> Two questions:
> >> >>
> >> >> 1. Since many sites can share the same IP, is
> there any way to tell
> >> >> all the websites which share an IP?
> >> >>
> >> >> 2. Assuming you have a "reseller account" with
> a hosting company,
> >> >> where they give you two IPs for your sites, is
> it possible or probable
> >> >> that they have also given someone else those
> same IPs? Is this common
> >> >> practice or not?
> >> >>
> >>
> >>> Yes, it's very common to "oversell" IP's since
> they are such a
> >>> precious thing,
> >>> nowadays. You should be able to find all of the
> hosts on a given IP
> >>> with
> >>> reverse DNS and some commercial web hosting
> services, like whois.sc.
> >>> Also,
> >>> Netcraft may give you that information, too.
> >>>
> >>
> >> Reverse DNS won't do it. I tried.
The only thing I know of that will do this kind of
thing is a DNS query. With the proper tool you should
be able to "copy" query the authoritative zone for the
address. I'm not sure how polite this would be...
it's sort of like setting up DNS replication. So it
might require a user/pass also. Never tried it on the
Internet, but does work on an Intranet when you have
all the "keys". On winders I use Superscan for this,
not sure what Linux alternative there is.
Rob
> >>
> >> Here's my understanding of how this works.
> Correct me if I'm wrong.
> >> Let's say server alfa is the authoritative DNS
> server for 50 domains.
> >> Its BIND tables show all the translations from
> sitename to IP. But a
> >> DNS query supplies a sitename and asks for an IP.
> Alfa is glad to
> >> oblige, but that query doesn't say anything about
> what *other* sites
> >> share that IP. Now, I don't know much about how
> DNS works. I don't
> >> know how those DNS tables are populated. Are
> there CNAME entries, A
> >> entries, PTR entries for each site in the tables?
> But how would you
> >> get a flush of those tables? Trying reverse DNS
> didn't do it. I'll
> >> supply the IP offlist, if you like (I don't want
> that IP up on the
> >> internet forever for people to hack).
> >>
> >> Whois.sc translates to domaintools.com. Their
> reverse DNS requires
> >> membership.
> >
> >
> >
> > Sorry that I can't help you more - I use whois.sc
> for that purpose. You
> > could
> > also try http://www.dnsstuff.com/
>
> Yeah, those are the guys I did reverse DNS with in
> the first place.
>
> Paul
>
> --
> Paul M. Foster
>
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