IP Address Classes

127.0.0.0 and below

127.0.1.0 to 191.255.255.255

192.0.1.0 to 223.255.255.255

Not allocated to networks -- mcast

240.0.0.0 and above; not assigned

Special numbers:

127.0.0.1 -- used for loopback addresses

192.168.x.x -- class B private networks

10.x.x.x. -- class A private networks

First bit == 0

First bits == 1 0

First bits == 1 1 0

First bits == 1 1 1 0

First bits == 1 1 1 1