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Re: [TCLUG:13925] IP Address range for a domain?




I will agree to some extent with the group on this one.  The host
providing DNS for a domain can direct subnets of a domain to whatever IP
set is needed.  Often, a client will want a web site hosted here, but mail
needs to relay out.  The clients web site is seen as www.xxxxx.com, part
of our IP scheme, but mail.xxxxx.com can be redirected to that fancy new
cable modem and mail server on their local lan.  That is why an "nslookup"
on the specific hostname in question is needed first.  i.e.: www.xxxxx.com
and mail.xxxxx.com may be from the same or may be from different blocks.  
The cable modem IP for the internal mail server, can have many names
attached to it too.

On a side note, this is just a convenience to some customers to make it
simple to remember the name of their mail server.  Redirecting MX records
with just the IP works just fine as well.  

Mark


On Wed, 23 Feb 2000, Nate Carlson wrote:

> On Tue, 22 Feb 2000, Thomas T. Veldhouse wrote:
> 
> > Here is what I am asking.
> > 
> > Does anybody know of a way to get the IP range for a given domain?
> > 
> > That's all I need.
> > 
> > Thanks,
> > 
> > Tom Veldhouse
> > veldy@visi.com
> 
> The thing is, there is no specific IP range assigned to a domain.. you can
> try doing an AXFR (ie, ls) of the domain, and block the IP's it returns,
> but they could always add more..
> 
> 

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