You want to find the services a domain controller is advertising.
The following command will display the list of services a domain controller is advertising:
> dcdiag /v /s:<DomainControllerName> /test:advertising
You can also use nltest to get similar information:
> nltest /server:<DomainControllerName> /dsgetdc:<DomainName>
The dcdiag /test:advertising command is a wrapper around the DsGetDcName method. DsGetDcName returns a structure called DOMAIN_CONTROLLER_INFO that contains the list of services a domain controller provides. Table 3-2 contains the possible values returned from this call.
3.12.4 See Also
MSDN: DsGetDcName and MSDN: DOMAIN_CONTROLLER_INFO