Subnet Calculator Calculate subnets based on an IP address and subnet mask. Display network, broadcast, and usable IP ranges. Subnet Mask 255.0.0.0 (/8)255.128.0.0 (/9)255.192.0.0 (/10)255.224.0.0 (/11)255.240.0.0 (/12)255.248.0.0 (/13)255.252.0.0 (/14)255.254.0.0 (/15)255.255.0.0 (/16)255.255.128.0 (/17)255.255.192.0 (/18)255.255.224.0 (/19)255.255.240.0 (/20)255.255.248.0 (/21)255.255.252.0 (/22)255.255.254.0 (/23)255.255.255.0 (/24)255.255.255.128 (/25)255.255.255.192 (/26)255.255.255.224 (/27)255.255.255.240 (/28)255.255.255.248 (/29)255.255.255.252 (/30)255.255.255.254 (/31)255.255.255.255 (/32)Custom... Calculate Result will appear here.