Yepper's- makes total sense... I saw is as a subnet mask @ first glance.
Thanks
Phil
----- Original Message -----
From: "Brian Keyser" <[EMAIL PROTECTED]>
To: "Circusnuts" <[EMAIL PROTECTED]>
Cc: <[EMAIL PROTECTED]>
Sent: Sunday, February 11, 2001 3:29 PM
Subject: Re: IP Multicast Addressing
> Phil,
> It has to do with the hight order bit. Look at the address space in
binary.
>
> The range 224.0.0.0 - 239.255.255.255 becomes:
>
> 11000000.00000000.00000000.00000000 through
> 11011111.11111111.11111111.11111111
>
> If you add that one bit so that the first octet becomes 1110 then you
> have moved past this boundry to become a class E address.
>
> Brian
>
> Circusnuts wrote:
>
> > I'm reading through McGraw Hill's BUMS book. Chapter 7 deals with IP =
> > Multicast Addressing. I understand that class D addresses are used =
> > (high order bits set to 1110), but a statement used in the book confuses
=
> > me:
> >
> > IP Multicast addresses start with 224.0.0.0 and end with 239.255.255.255
> >
> > I'm not real keen on where the 239 came from...
> >
> > Thanks All !!!
> > Phil=20
> >
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