finding dyndns names for existing IP

[Thomas Kerbl <t.kerbl () weigl de>]

Hello,

I'm searching for a way to find DynDns names to existing IPs. We are 
working on a pen-test for a customer, who has a dynamic IP that changes 
every day, and it is hard for us to keep track of their Gateway. We 
simulate an attacker without intern knowledge, so we cannot simple ask 
for a dyndns name. Social Engineering would be easy, but I'm locking for 
a technical way to do it. We already tried obvious names like 
companyname.dyndns.org and similar DNS names.

To try to summarize the problem:

1) We assume the company uses the DynDns service (or a similar service).
2) We got the actual valid IP through social engineering.
3) We want to find the dyndns name of this IP to keep track.

Is there a Database hostet by dyndns (or similar service)  we can 
consult? Or is there a way to do a reverse lookup on the IP?

thanks a lot for any pointers,
Thomas Kerbl

--
~ weigl interservice
~ www.weigl.de


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