What about 224.0.0.0

What is 224.0.0.0  (?) somewhere I have read that is used if I'm going to use multicast applications. can I have more help about this address.  
vage78Asked:
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liddlerCommented:
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sunnycoderCommented:
Hi vage78,

route 224.0.0.0 is the default route for multi-casting

from rfc 1054 --Host Extensions for IP Multicasting

In Internet standard "dotted decimal" notation, host group addresses range from 224.0.0.0 to 239.255.255.255. The address 224.0.0.0 is guaranteed not to be assigned to any group, and 224.0.0.1 is assigned to the permanent group of all IP hosts. This is used to address all multicast hosts on the directly connected network. There is no multicast address (or any other IP address) for all hosts on the total Internet. The addresses of other well-known, permanent groups are to be published in "Assigned Numbers".

Cheers!
Sunny:o)
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vage78Author Commented:
What is the multicasted address?
Do you mean all internet hosts?
In what applications  (multicasted applications) is this usefull?
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sunnycoderCommented:
Multicast. With a multicast design, applications can send one copy of each packet and address it to the group of computers that want to receive it. This technique addresses packets to a group of receivers rather than to a single receiver, and it depends on the network to forward the packets to only the networks that need to receive them.

further reading
http://www.cisco.com/warp/public/614/17.html
http://www-mae.engr.ucf.edu/~ssd/multicast.html

read the related rfcs
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vage78Author Commented:
May I have an example please with some explanations?
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chris_calabreseCommented:
You're most likely to see this address if you have routers using VRRP for failover. They use this address to send each other their state updates.
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mburdickCommented:
Multicast means that packets are transmitted to a "group" of devices at a time. This allows for traffic to be minimized on the network while increasing the number of end stations that receive the traffic. Multicasting is used for a variety of purposes, including:

- Multimedia broadcasts
- Routing protocols (not all)
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