Mailinglist Archive: opensuse (3513 mails)

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Re: [opensuse] What's wrong with this IP address?
  • From: Robert Paulsen <robert@xxxxxxxxxxxxxxxxx>
  • Date: Thu, 8 Jan 2009 09:48:42 -0600
  • Message-id: <200901080948.42732.robert@xxxxxxxxxxxxxxxxx>
On Thursday 08 January 2009 9:36 am, Boris Epstein wrote:
On Thu, Jan 8, 2009 at 10:33 AM, Robert Paulsen

<robert@xxxxxxxxxxxxxxxxx> wrote:
On Thursday 08 January 2009 9:16 am, Per Jessen wrote:
250.146.71.215

See http://en.wikipedia.org/wiki/IP_address#IP_version_4_addresses

That will show you that the first octet of an ipv4 IP address can range
from

1 - 223

For classes A, B, and C.



Just out of the curiousity, is there any good rationale for having it this
way?


Look at the bit pattern in the 2nd column in the table that defines the three
classes:

A 0XXX XXXX
B 10XX XXXX
C 110X XXXX

I guess they might be able define additional classes:

D? 1110 XXXX
E? 1111 0XXX

etc. I don't know why it stops at A,B,C, but suspect it might have something
to do with routers and how they can break up address ranges to direct IPs to
different networks. This other bits might take on different meanings.

Anyone know any better?

Bob
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