[thelist] DNS Lookup question

[Matt McKeon]

Hey All,

Is it possible to find out all the sub-domains of a domain? For 
instance, if I created A records for private.domain.com and 
secret.domain.com; are there tools that one could run to find those 
sub-domains if they are aware of domain.com?

I tried some online tools and searched around a bit but couldn't come up 
with anything useful. Just want to make sure before I roll some stuff out...

Thanks,
Matt