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Classes of ip addresses

Every ip address belongs to a specific class.
The ip address classes are:

IP Classes

But how is an Ip address related to a class?

It’s very easy. For example let’s try to find the class of the Ip address 172.16.1.1
The only thing we have to do is to look at the first octet of the Ip address. As you can see, it is 172.If you look at the table above, you will see that 172 is a number between 128 and 191. Easily you can tell that 172.16.1.1 is a class B Ip address.

According to the example above, Ip address 172.16.1.1 has the default subnet mask of 255.255.0.0

O.K. so what?

When finding the class of an Ip address, automatically you find the default subnet mask for this Ip.

In one of the next articles, I’ll try to explain “The importance of Subnet Mask”.

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This entry was posted on Wednesday, September 19th, 2007 at 6:24 pm and is filed under General Networking. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.

2 Responses to “Classes of ip addresses”

  1. Pugs says:
    September 20, 2007 at 8:17 pm

    I would like to note that in RFC 1817 (http://www.faqs.org/rfcs/rfc1817.html) We officially lose the classes that we are so used to and Cisco refused to drop them from their material. even thou one of there own wrote the rfc (Yakov Rekhter).

    I stumbledupon this.

  2. Casandra Bradford says:
    January 9, 2009 at 8:50 pm

    hi
    uvv6i289hbargx93
    good luck

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