• Subject: Re: Confusion reigns supreme (TCP/IP)
  • From: dhandy@xxxxxxxxxxx (Douglas Handy)
  • Date: Thu, 07 Oct 1999 22:04:02 -0400

Jim,

> I asked him for our range, since it said here block size /28 and I
>thought
>that referred to our block of ip addresses, apparently not.  He is the one who
>gave
>me the range.

The /28 is a shorthand way of saying the first 28 (of 32) bits are the
subnet mask.  IOW, /28 is the same as 255.255.255.240 in the dotted
decimal format.  Originally, subnet masks could be assigned without
all the 1 bits being consecutive, so the mask format was needed to
uniquely specify which bits made up the mask.  Now the masks are
always assigned as consecutive strings of 1 bits followed by all 0
bits.  Hence, the /xx method of describing the subnet mask.

Doug
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