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.135.40.10.0/22 B.135.40.12.0/22 C.135.40.8.0/22 D.135.40.6.0/21