The following ports are used for AD Communications

TCP/UDP port 53: DNS
TCP/UDP port 88: Kerberos authentication
TCP/UDP port 135: RPC
TCP/UDP port 137-138: NetBIOS
TCP/UDP port 389: LDAP
TCP/UDP port 445: SMB
TCP/UDP port 464: Kerberos password change
TCP/UDP port 636: LDAP SSL
TCP/UDP port 3268-3269: Global catalog