reverse lookup question...

[Kevin Darcy]

Wouter Sonneveldt wrote:

> Why I'm asking is the following:
>
> Our company doesn't host its own DNS-records. This is done by our ISP. Now
> we want to change ISP's, but still have our names working. But our old ISP
> is having "trouble" finding which registered domain-names we have (stupid
> huh?).

Yeah, that's pretty stupid. Why don't they just grep that IP address from
their zone files?

Alternatively, why don't you/they look in the web/mail/etc. logs and just see
what domain names clients are using to access your websites/servers/etc.?

Failing those methods, if your ISP used only one registrar for all of your
gTLD domain names, and a consistent owner name on all of them, then maybe the
registrar can generate a "all domains owned by X" kind of report.


- Kevin

>
>
> "Simon Waters" <Simon at wretched.demon.co.uk> wrote in message
> news:9hab07$hbn at pub3.rc.vix.com...
> >
> > Wouter Sonneveldt wrote:
> > >
> > > Does anybody know if it is possible to generate for one specific ip
> address
> > > (registered by my company) a complete list of DNS-names that are
> associated
> > > with that address?
> > > If I do a 'dig -x 111.222.333.444', I get only one name for each
> ip-address,
> > > but I know there are more...
> >
> > In general no - you want to do an "inverse query" and the
> > DNS just doesn't do them. The reverse look up is a special
> > case, but you can only look up data that has been entered.
> >
> > If all the zones pointing at this address are your's try
> > "grepping" the zone files.
> >
> > Why do you ask?
> >
> > Simon
> >
> > PS: Having only one PTR record per IP address is probably
> > sensible, as most software that looks at them only gets
> > confused if you have more than one.
> >
> >