[GLLUG] Finding IP ranges (similar to dig)??

[Richard Houser]

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Benjamin Cathey wrote:
> Is there a tool to allow you to find ALL variations of IPs for a certain domain?  For instance, lcc.edu, angel.lcc.edu and starport.lcc.edu - all different IPs.  Is there a way (online or with a tool) to get all variations on the www that they use and all the IPs associated with it?  
> 
> The reason I ask I have a locked down public terminal (using the a firewall box (running smoothwall 2.0) and I need to open it up so people can check their grades, etc.  I know of those 3 ips but there MUST be others as well.


I think the bigger question is WHY?  If you are trying to allow web
traffic, just handle it at the application layer with a transparent http
proxy.  At that point, you can just allow any access to the domain in
question regardless of the IP.  If this is outside of ftp or http and
the protocol in question doesn't support domain names, things can get
more difficult, but you could still find a way to trap new outgoing DNS
requests and dynamically unblock anything returned for lcc.edu.
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