Mailinglist Archive: opensuse (3513 mails)

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Re: [opensuse] What's wrong with this IP address?
  • From: James Knott <james.knott@xxxxxxxxxx>
  • Date: Thu, 08 Jan 2009 15:02:29 -0500
  • Message-id: <49665BD5.3080808@xxxxxxxxxx>
Robert Paulsen wrote:


Thinking about this I note the following about "subnets" (defined by bit masks):

CLASS CLASS BITS SUBNET BITS
A 0XXX XXXX 1111 1111 . 0000 0000 . 0000 0000 .
0000 0000
B 10XX XXXX 1111 1111 . 1111 1111 . 0000 0000 .
0000 0000
C 110X XXXX 1111 1111 . 1111 1111 . 1111 1111 .
0000 0000

After class C we run out of usable subnet bits (can't use all ones as that would leave no bits to identify individual hosts).

Bob

With classless addressing, it's possible to have as few as 2 hosts. Further, links such as PPP can have a mask of 255.255.255.255, because there's only one host at the end of the link.


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