Internetworkers: http://www.ibiblio.org/internetworkers/

[Steven Champeon <schampeo AT hesketh.com>]

on Wed, Dec 13, 2006 at 09:25:16AM -0500, zman wrote:
> On Wed, 13 Dec 2006, Michael Czeiszperger wrote:
> >>> How does that work if there's multiple domains being hosted from the
> >>> same machine, all from the same IP address?  I'm assuming that the
> >>> single IP address is only going to resolve to a single domain name,
> >>> meaning the rest of the domains are out of luck?
> 
> Not at all, there are plenty of domains that are on the same IP, way
> more than you would think. ARIN has gotten really hard to get IP space
> from and now a lot of ISP's and hosting companies will serve the
> multiple domains from the same IP, there is absolutely nothing wrong
> with this at all.... no to mention the fact that most business' have
> multiple doamins for the same business...

Scott, there's a difference between host->IP mapping and IP->PTR
mapping. No, there's nothing wrong with the former, but seeing multiples
on the latter is very rare. I've only seen it (after looking at thousands
of IPs over the last three years or more) on a few Mexican ISPs and very
rarely outside of that.

> >> There's nothing wrong with a single IP having multiple PTRs, though it
> >> is rare to see it.
> 
> not so much... look again...

No, it's very rare. Trust me. Or, pick any random set of IPs large enough
to satisfy your curiousity and look at their PTRs.
 
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