Multicast IP Addresses Overview

This topic is to discuss the following lesson:

Awesome post we’ve got here…

But a couple of things that didn’t quite sync in my mind.

First; When you mention that RIPv2 ( and basically the range is NOT routed between subnets, so my question is how RIPv2-aware routers advertise RIPv2 routes?

Second; Can you give an example of a work with, cos I fear that if I applied it on a typical LAN (where I’m restricted to use only private IP addresses) that is connected to the Internet, it cause a conflict… Ain’t that right?

Hi M. Bahwal,

Multicast traffic in the range is processed by routers but it won’t be “routed” to another subnet. Imagine a couple of routers connected to each other to a switch. They’ll use to communicate with each on this segment. These routers won’t forward these multicast packets to other interfaces.

What kind of multicast example are you looking for? There are many different configurations…

Best Regards,


“The – range h…”
I think multicast address range is

Hi Navin,

The - is a “special” range that IANA has assigned for certain applications, these addresses are not routed outside of the subnet. For example, RIPv2, OSPF, EIGRP, etc.



for 224 range : One such example could be “ospf hello” which is not a user traffic but traffic among routers and does not require to be routed.
where-in for 239 range …it is a multicast user traffic . thats how IANA has separated both range for multicast…is that correct to say?

This is generally correct, with a couple of clarifications:

  1. When you say “224 range” specifically, that is which is the range reserved for traffic on the local segment only. Any 224 network higher, say has no special significance.

  2. The is not really defined as user traffic vs router traffic. Its significance is that it is available for private organizational use. Think of this as being the same thing as, or for private IPv4 spaces.

Awesome. clears the doubt now.

Hi Andrew ,
A doubt on higher level …
I was trying to understand connection between AND in MULTICAST concept.
So any video server, once connects to router (so there must be some app that pump video traffic towards router) and router once configured “with respective config” , start sending traffic towards IP And then hosts (typically equipped with an application such as VLC ) that are configured with “related host config” get this feed via that multicast router.

  1. So Is it always or we can change this IP?
  2. where does range comes in to scene ?



  1. The range is entirely reserved for private, organization use. This means, the range from - can be used anyway you like–so long as the traffic stays within the bounds of a private address of a company. This means your video server could be configured to use any address between and if your goal to ensure you are using the “private” multicast range.

  2. For, I was just trying to make the point that when you originally said “224 range” that in order for your statement to be accurate, you need to make sure you are saying “” was an example I gave of something that could be considered within the “224 range” but is NOT actually reserved for local segment multicast traffic. There is nothing special at all about