Splitting a Class C is possible

Back in March, I had a discussion with one of my teacher. It was a course about networking and he was allegating that you cannot make two subnets out of a Class C.

My first reaction was that Classes are meaningless and he should use prefixes to describe routing. But my second thought was: what the hell is he talking about? Of course you can subnet a Class C. In prefixes terms, that's a /25.

I then tried to explain why it works and how he was misleaded. But then again, some people tend to believe that a student cannot be right. Then I came across this on ARIN:

olivier@sheep olivier $ whois NET-65-39-193-0-1

CustName: Peer1 Internet Bandwidth
Address: 2100-555 W. hastings St.
City: Vancouver
StateProv: BC
PostalCode: V6B-4N5
Country: CA
RegDate: 2002-12-02
Updated: 2002-12-02

NetRange: 65.39.193.0 - 65.39.193.127
CIDR: 65.39.193.0/25

I am sorry to say, not only half of a Class C can be routed, it can also be routed on the Internet. Should I be a smart mouth and send an email to my kind teacher?

This entry was posted by Olivier Hill on Tuesday, June 21. 2005 at 22:01. and is filed under Computers. You can leave a response, or trackback from your own blog.

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  1. Talie says:
    #1 2005-06-21 22:28 (Reply)

    You could send him an email, but it would probably be filled with hundreds of "c'est clair" and nothing would be clear at all!


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