online CIDR and IP subnet calculator : Check host

51.254.199.0-51.254.199.255
51.254.199.0/24

51.254.200.0-51.254.207.255
51.254.200.0/21

51.254.208.0-51.254.223.255
51.254.208.0/20

51.254.224.0-51.254.255.255
51.254.224.0/19

51.255.0.0-51.255.7.255
51.255.0.0/21

51.255.8.0-51.255.11.255
51.255.8.0/22

51.255.12.0-51.255.13.255
51.255.12.0/23

51.255.14.0-51.255.14.255
51.255.14.0/24

IP subnet calculator 51.254.199.0-51.255.14.255