To locate your global catalog server(s) within a network, follow the instructions below:

1) Click Start
2) Program Files
3) Click Administrative Tools
4) Click Active Directory Sites and Services
5) Expand Active Directory Sites and Services
6) Expand Sites
7) Expand Site-name
8.) Expand Servers
9) Expand server name
10) Right click NTDS Setting
11) Click properties
12) Check to see Global Catalog is enabled. If yes, you have located one of your Global Catalog servers.