Why is IP range 225 invalid?

Posted on 2010-11-18
Last Modified: 2012-05-10
I have been asked to setup a secondary address in the range of  and found out if was invalid.   Why is this an illegal ip space and how can I find out more about it?   Google searches have not turned up anything as of yet.

Question by:DanRaposo
  • 4
  • 2
LVL 10

Expert Comment

ID: 34165623

225 falls in class D ip address which is for multi casting
LVL 10

Expert Comment

ID: 34165662


You cannot use this ip address for normal assignment which is reserved for multi casting.

Assisted Solution

Marvinlau earned 100 total points
ID: 34165700

the class D on networking, is used for multicast (communication with a group of computers), Its range is -

3 Use Cases for Connected Systems

Our Dev teams are like yours. They’re continually cranking out code for new features/bugs fixes, testing, deploying, testing some more, responding to production monitoring events and more. It’s complex. So, we thought you’d like to see what’s working for us.

LVL 10

Accepted Solution

moon_blue69 earned 400 total points
ID: 34165717
please find the attached guide

Author Comment

ID: 34166259
Great help guys ... before I accept and close can I ask for a bit more clarification?  In the Guide posted by Moon Blue69 it says

3.8.4 Class D And E Addresses
Class D networks are used for multicasting and do not contain network or host IDs. Multicasting is the process of sending a message simultaneously to more than one destination on a network. The first octet of a Class D address ranges from 224 to 239.
       Multicasting is often used to send information simultaneously to several registered hosts. A computer will register itself using a Class D address.

How do you register a computer with a Class D address if you cannot assign it to a NIC?

Author Comment

ID: 34166323
I found some interesting info ....

Thanks guys ...
LVL 10

Expert Comment

ID: 34166358
You will have a class D ip address on multicast and you add the ip address of the participients of the multicast. You cast to one IP that is class D and the all the listed participients will recive it.

Hope this clarified it


Featured Post

NAS Cloud Backup Strategies

This article explains backup scenarios when using network storage. We review the so-called “3-2-1 strategy” and summarize the methods you can use to send NAS data to the cloud

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
configuring snmp v2 or v3 on Cisco switches 2 56
server can't ping default gateway 25 126
IPV6 and AWS 3 87
Is WiFi half-duplex or Full -duplex 4 49
AWS has developed and created its highly available global infrastructure allowing users to deploy and manage their estates all across the world through the use of the following geographical components   RegionsAvailability ZonesEdge Locations  Wh…
Security is one of the biggest concerns when moving and migrating your data from your on-premise location to the Public Cloud.  Where is your data? Who can access it? Will it be safe from accidental deletion?  All of these questions and more are imp…
After creating this article (, I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…
After creating this article (, I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…

810 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question