Subnet Calculator Network Class A B C First Octet Range IP Address Hex IP Address Subnet Mask 255.255.255.0 255.255.255.128 255.255.255.192 255.255.255.224 255.255.255.240 255.255.255.248 255.255.255.252 Wildcard Mask Subnet Bits 0 1 2 3 4 5 6 Mask Bits 24 25 26 27 28 29 30 Maximum Subnets 1 2 4 8 16 32 64 Hosts per Subnet 254 126 62 30 14 6 2 Host Address Range Subnet ID Broadcast Address Subnet Bitmap