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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