[ActiveDir] Determine user's Netbios/DNS Domain Name

[Brian Desmond]

Is there an attribute that I can look at if I'm bound to a username to find out the 
user's domain name?
 
For example, if I'm bound to myself:
 
 CN=$Brian Desmond,OU=Tech Dept,OU=Accounts,DC=payton,DC=cps,DC=k12,DC=il,DC=us
 
How can I programatically determine one of the two: my netbios domain name is WPCP or 
my DNS name is payton.cps.k12.il.us?
 
Thanks,
Brian