Feb 172007
 

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Different types of Classes of Network

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.

 Posted by at 5:23 am

  4 Responses to “Special Purpose Network Addresses Every System admin need to know”

  1. Correct me if I’m wrong but Class A, B, C addresses are of less relevence with the use of netmasks.

  2. It would be nice to have the private ranges listed here.

  3. Classes still have relevance, because classless routing is just an option.

  4. What is difference between node address and ip address ? is node address is equal to ip address of router or mac address of it ?

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