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IP subnet calculator
128.242.180.240-128.242.255.255

128.242.180.240-128.242.180.255
128.242.180.240/28

128.242.181.0-128.242.181.255
128.242.181.0/24

128.242.182.0-128.242.183.255
128.242.182.0/23

128.242.184.0-128.242.191.255
128.242.184.0/21

128.242.192.0-128.242.255.255
128.242.192.0/18