Special Purpose Network Addresses Every System admin need to know
Posted by Admin on February 17th, 2007
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.
February 17th, 2007 at 8:21 am
Correct me if I’m wrong but Class A, B, C addresses are of less relevence with the use of netmasks.
March 4th, 2007 at 6:52 pm
It would be nice to have the private ranges listed here.
March 4th, 2007 at 6:53 pm
Classes still have relevance, because classless routing is just an option.
February 9th, 2010 at 1:09 pm
What is difference between node address and ip address ? is node address is equal to ip address of router or mac address of it ?