online CIDR and IP subnet calculator : Check host

81.248.240.0-81.248.255.255
81.248.240.0/20

81.252.0.0-81.252.127.255
81.252.0.0/17

81.252.128.0-81.252.159.255
81.252.128.0/19

81.252.160.0-81.252.167.255
81.252.160.0/21

81.252.168.0-81.252.171.255
81.252.168.0/22

81.252.172.0-81.252.172.255
81.252.172.0/24

81.249.0.0-81.249.255.255
81.249.0.0/16

81.250.0.0-81.251.255.255
81.250.0.0/15

IP subnet calculator 81.248.240.0-81.252.172.255