IP subnet calculator

148.72.0.0-148.72.89.255

148.72.0.0-148.72.63.255
148.72.0.0/18

148.72.64.0-148.72.79.255
148.72.64.0/20

148.72.80.0-148.72.87.255
148.72.80.0/21

148.72.88.0-148.72.89.255
148.72.88.0/23