The 239.255.255.255 is the highest in that subnet. D class starts at 224
(1110) and then E class would start at 240 (1111). This makes the D class
range of addresses: 224.0.0.0 through 239.255.255.255. Therefor if D class
addresses are used for multicasting then the 239.255.255.255 address would be
the last address in that range before falling into an E class address. Here
are the ranges:
A = 1.0.0.0 - 127.255.255.255
B = 128.0.0.0 - 191.255.255.255
C = 192.0.0.0 - 123.255.255.255
D = 224.0.0.0 - 239.255.255.255 << Here is the multicast range (I believe)
E = 240.0.0.0 - 247.255.255.255
Hope I helped (and was right) =o)
Mark Z...
In a message dated 2/10/01 4:56:54 PM Eastern Standard Time,
[EMAIL PROTECTED] writes:
> Class D's have 1110 (which add up to 224) being the high order bits. You
> may be onto something... but how would you explaining the 239.255.255.255
> subnet mask. This is where I drop into the "hu" faze.
>
> Thanks Tim
> Phil
>
> ----- Original Message -----
> From: "Tim" <[EMAIL PROTECTED]>
> To: "Circusnuts" <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>
> Sent: Saturday, February 10, 2001 6:20 PM
> Subject: RE: IP Multicast Addressing
>
>
> > I'm just a little CCNA, I don't know what IP multicasting is,
> > but I believe class E networks have 4 higher order bits set to 1,
> > ie 240 - which explains why Class D's end at 239.255.255.255
> >
> > (I think!)
> >
> > -----Original Message-----
> > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
> > Circusnuts
> > Sent: 10 February 2001 16:43
> > To: [EMAIL PROTECTED]
> > Subject: IP Multicast Addressing
> >
> >
> > 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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