IP subnet calculator

111.61.0.0-111.63.79.255

111.63.0.0-111.63.63.255
111.63.0.0/18

111.63.64.0-111.63.79.255
111.63.64.0/20

111.61.0.0-111.61.255.255
111.61.0.0/16

111.62.0.0-111.62.255.255
111.62.0.0/16