IPv4

Header

IPv4 addresses are 32 bits (4 bytes) in length.

Classes

Loopback Address

Address range

• 127.0.0.0

• 127.255.255.255

Used to test the 'network stack' (think OSI, TCP/IP model) on the local device.

Network Adress

Host portion of the address is all 0's.

The network address cannot be assigned to a host.

Broadcast Address

Host portion of the address is all 1's.

The broadcast address cannot be assigned to a host.

Netmask

Class A

• /8

• 255.0.0.0

Class B

• /16

• 255.255.0.0

Class C

• /24

• 255.255.255.0