online CIDR and IP subnet calculator : Check host

81.218.209.0-81.218.209.255
81.218.209.0/24

81.218.210.0-81.218.211.255
81.218.210.0/23

81.218.212.0-81.218.215.255
81.218.212.0/22

81.218.216.0-81.218.223.255
81.218.216.0/21

81.218.224.0-81.218.227.255
81.218.224.0/22

81.218.228.0-81.218.229.255
81.218.228.0/23

81.218.230.0-81.218.230.255
81.218.230.0/24

IP subnet calculator 81.218.209.0-81.218.230.255