How to get the global catalog server name of my forest?

1- Open Active Directory Sites & services.

2- expand Sites.

3- Expand Default-First-Site-Name>

4- Expand Servers.

on the right pane you will find word GC " Global Catalog" under DC type beside Every GC server.

nslookup gc._msdcs.example.root 

which will get the list of GC

1- Open Active Directory Sites & services.

2- expand Sites.

3- Expand Default-First-Site-Name>

4- Expand Servers.

on the right pane you will find word GC " Global Catalog" under DC type beside Every GC server.

Another way using cmd

1. Open a CMD.EXE window.

2. Type the following command and press Enter:

nslookup gc._msdcs.%USERDNSDOMAIN%

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