IP classes

IP CLASSES

The internationally-established private IP address ranges that can be assigned to internal network computers are as follows:

• 10.0.0.1 through 10.255.255.254
• 16,777,214 addresses
• 16,777,214 computers on 1 network
  (10.x.x.x)
• Uses a subnet mask of 255.0.0.0
• First octet must be the same on all computers
• A Class A address range

• 172.16.0.1 through 172.31.255.254
• 1,048,574 addresses
• 65,534 computers on each of 16 possible networks
  (172.16.x.x to 172.31.x.x)
• Uses a subnet mask of 255.255.0.0
• First two octets must be the same on all computers
• A Class B address range

• 192.168.0.1 through 192.168.255.254
• 65,534 addresses
• 254 computers on each of 256 possible networks
  (192.168.0 to 255.x)
• Uses a subnet mask of 255.255.255.0
• First three octets must be the same on all computers
• A Class C address range