Port 3268 TCP UDP
Microsoft Global Catalog (LDAP) Service.
MSFT-GC is Microsoft (MSFT) Global Catalog (GC)
An LDAP service which contains data from Active Directory (AD) forests, and is also a Domain Controller (DC). These Global Catalog servers are Domain Controllers (DC's) which store additional infomration for all of the objects that exist within an AD forest.
Assuming you're within an infrastructure that has AD, you can query the SRV records of the domain (whatportis.com in this example) to find all of the Global Catalog servers - The NSlookup command for example would be:
A Microsoft Global Catalog is a Microsoft Windows Server 2003 service that stores a partial replica of the Active Directory directory service and can be used to search for objects in any domain in the forest. The Global Catalog is used by clients when they log on to the network. The Global Catalog is also used by applications that need to locate objects in Active Directory, regardless of the domain in which the objects reside.
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External Links: Microsoft TechNet