IP subnet calculator

89.64.0.0-89.77.0.17

89.77.0.0-89.77.0.15
89.77.0.0/28

89.77.0.16-89.77.0.17
89.77.0.16/31

89.64.0.0-89.71.255.255
89.64.0.0/13

89.72.0.0-89.75.255.255
89.72.0.0/14

89.76.0.0-89.76.255.255
89.76.0.0/16