Example IP Address / Subnet Mask Configurations

The following are some example combinations of Class A, B and C networks, with and without subnetting. All examples are using RFC 1918 Class A, B and C reserved networks.

When setting up a network at home, you may wish to use one of the following configurations.

• Class A Address, No Subnets, 16 777 214 hosts

• Network : 10.0.0.0
• Subnets : None
• Subnet Mask : 255.0.0.0 (default - 1 octet network, 3 octets host)
• Node Addresses : 10.0.0.1 to 10.255.255.254

• Class A Address, 65 534 subnets, 254 hosts per subnet

• Network : 10.0.0.0
• Subnets : 10.0.1.0 to 10.255.254.0
• Subnet Mask : 255.255.255.0 (1 octet network, 2 octets subnet, 1 octet host)
• Node Addresses : 10.S.S.1 to 10.S.S.254 (S = subnet number)

• Class B Addess, 254 subnets, 254 hosts per subnet

• Network : 172.16.0.0
• Subnets : 172.16.1.0 to 172.16.254.0
• Subnet Mask : 255.255.255.0 (2 octets network, 1 octet subnet, 1 octet host)
• Node Addresses : 172.16.S.1 to 172.16.S.254 (S = subnet number)

• Class C Address, 6 subnets, 30 nodes per subnet

• Network : 192.168.1.0
• Subnets : 192.168.1.32, 192.168.1.64, 192.168.1.96, 192.168.1.128, 192.168.1.160, 192.168.1.192
• Subnet Mask : 255.255.255.224 decimal - 1111 1111.1111 1111.1111 1111.1110 0000 binary (3 octets network, 3/8ths octet subnet, 5/8ths octet host)
• Node Addresses : 192.168.1.33-62, 192.168.1.65-94, 192.168.1.97-126, 192.168.1.129-158, 192.168.1.161-190