Special Purpose Network Addresses Every System admin need to know

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Class A Addresses

Class A address must be between 0 and 127

network.node.node.node

Class B Addresses

Class A address must be between 128 and 191

network.network.node.node

Class C Addresses

Class A address must be between 192 and 223

network.network.network.node

Network Addresses: Special Purpose

Some IP addresses are reserved for special purposes, so network administrators can’t ever assign these addresses to nodes.

Network address of all 0s -- Interpreted to mean “this network or segment.”

Network address of all 1s - Interpreted to mean “all networks.”

Network 127.0.0.0 -- Reserved for loopback tests. This address designates the local node and allows that node to send a test packet to itself without generating network traffic.

Node address of all 0s -- Interpreted to mean “network address” or any host on a specified network.

Node address of all 1s -- Interpreted to mean “all nodes” on the specified network;for example, 128.2.255.255 means all nodes on network 128.2 (which is a Class B address).

Entire IP address set to all 0s -- Used by Cisco routers to designate the default route.This address could also mean “any network.”

Entire IP address set to all 1s - (same as 255.255.255.255) Broadcast to all nodes on the current network;sometimes called an all 1s broadcast or a limited broadcast.

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