| Protocol and Port | AD and AD DS Usage | Type of traffic |
| TCP and UDP 389 | Directory, Replication, User and Computer Authentication, Group Policy, Trusts | LDAP |
| TCP 636 | Directory, Replication, User and Computer Authentication, Group Policy, Trusts | LDAP SSL |
| TCP 3268 | Directory, Replication, User and Computer Authentication, Group Policy, Trusts | LDAP GC |
| TCP 3269 | Directory, Replication, User and Computer Authentication, Group Policy, Trusts | LDAP GC SSL |
| TCP and UDP 88 | User and Computer Authentication, Forest Level Trusts | Kerberos |
| TCP and UDP 53 | User and Computer Authentication, Name Resolution, Trusts | DNS |
| TCP and UDP 445 | Replication, User and Computer Authentication, Group Policy, Trusts | SMB,CIFS,SMB2, DFSN, LSARPC, NbtSS, NetLogonR, SamR, SrvSvc |
| TCP 25 | Replication | SMTP |
| TCP 135 | Replication | RPC, EPM |
| TCP Dynamic | Replication, User and Computer Authentication, Group Policy, Trusts | RPC, DCOM, EPM, DRSUAPI, NetLogonR, SamR, FRS |
| TCP 5722 | File Replication | RPC, DFSR (SYSVOL) |
| UDP 123 | Windows Time, Trusts | Windows Time |
| TCP and UDP 464 | Replication, User and Computer Authentication, Trusts | Kerberos change/set password |
| UDP Dynamic | Group Policy | DCOM, RPC, EPM |
| UDP 138 | DFS, Group Policy | DFSN, NetLogon, NetBIOS Datagram Service |
| TCP 9389 | AD DS Web Services | SOAP |
| UDP 67 and UDP 2535 | DHCP Note DHCP is not a core AD DS service but it is often present in many AD DS deployments. | DHCP, MADCAP |
| UDP 137 | User and Computer Authentication, | NetLogon, NetBIOS Name Resolution |
| TCP 139 | User and Computer Authentication, Replication | DFSN, NetBIOS Session Service, NetLogon |