Special Purpose Network Addresses Every System admin need to know
Posted by Admin on February 17th, 2007
If you're new here, you may want to subscribe to my RSS feed. Thanks for visiting!
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.