IP subnet calculator

51.15.0.0-51.15.45.255

51.15.0.0-51.15.31.255
51.15.0.0/19

51.15.32.0-51.15.39.255
51.15.32.0/21

51.15.40.0-51.15.43.255
51.15.40.0/22

51.15.44.0-51.15.45.255
51.15.44.0/23