The best tool to figure out how your network looks like in a MS Domain is nmblookup. Following commands should tell you what you need to know:
nmblookup -R -U 192.168.1.55 WORKGROUP#1Cwhere 192.168.1.55 is the IP address of your WINS server and WORKGROUP is the domainname. This results in a list of the domain controllers available on your network. You could also request the Domain Master Browser by doing:
nmblookup -R -U 192.168.1.55 WORKGROUP#1BThis should result is the IP address of the PDC, since according to the rules in Microsoft Networking, the PDC must be the Domain Master Browser.
To collect all functions of a single host use:
nmblookup -R -A 192.168.1.66or if you want to do it based on NETBIOS name use:
nmblookup -R -A 192.168.1.55 -n MyPDC