A.2 B.4 C.6 D.8
A.255.255.248.0 B.255.255.240.0 C.255.255.252.0 D.255.255.255.0
A.133.24.8.0/22 B.133.24.12.0/22 C.133.24.8.0/21 D.133.24.12.0/21