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Internet Protocol Classes

IP Address Classes

The 5 Different Classes Of IP Address

Class A : to
Class B : to
Class C : to
Class D : to
Class E : to

The following table shows the IP Addresses that you should avoid using:

IP Address



Refers to the default route. This route is to simplify routing tables used by IP.


Reserved for Loopback. The Address is often used to refer to the local host. Using this Address, applications can address a local host as if it were a remote host.

IP Address with all host bits set to "0" (Network Address) e.g

Refers to the actual network itself. For example, network can be used to identify network 192.168. This type of notation is often used within routing tables.

IP Address with all node bits set to "1" (Subnet / Network Broadcast) e.g

IP Addresses with all node bits set to "1" are local network broadcast addresses and must NOT be used.

Some examples: (Class A) , (Class B), (Class C). See "Multicasts" & "Broadcasts" for more info.

IP Address with all bits set to "1" (Network Broadcast) e.g

The IP Address with all bits set to "1" is a broadcast address and must NOT be used. These are destined for all nodes on a network, no matter what IP Address they might have.

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