Agreed. While it is possible to supernet class A addresses, it is generally impractical for the most part, unless the ISP/AS that is summarizing two Class A addresses owns both address spaces (and they are contiguous). I might suspect that somebody such as UUNet or AOL or Sprint might do it, but checking the ARIN registry and IANA, I cannot readily find any of them with contiguous netblocks in the Class A address space for ISP use. There are a few, but I would expect those that exist to get returned back to IANA for reassignment (watch wrap):
http://www.iana.org/assignments/ipv4-address-space Class B and Class C address space is an entirely different matter w.r.t supernetting. You will note that just about all of the Class C address space is set up and optimized for supernetting based upon registry (read geographic) allocation. That makes sense. HTH, Paul Werner ---- On Sat, 27 Oct 2001, Thomas Larus ([EMAIL PROTECTED]) wrote: > Great point. It's not a supernet of anything. Not with the first octet > being 24. > > Thomas Larus > > > ----- Original Message ----- > From: "Paul Werner" > To: ; "[EMAIL PROTECTED]" > Sent: Saturday, October 27, 2001 4:02 PM > Subject: Re: Subject: Re: quick response (help) please [7:24238] > > > > Just as a clarification to what you wrote and the terminology > > that you used, how exactly are you defining a "Supernet," > > particularly on this network? > > > > v/r, > > > > Paul Werner > > > > > I could be wrong here, but I would imagine the reason this > > works is that > > > you > > > have a supernet there, with the mask of 255.255.248.0, so the > > hosts > > > address > > > is not all-ones, so is not treated as a broadcast address. > > The host > > > address > > > includes 3 binary digits from the third octet (125), so it > > works out to > > > be > > > 101 11111111. I guess that zero saves it from being a > > broadacst > > > address. > > > > > > Is this right, or did the Cable ISP just screw up? > > > > > > Thomas Larus > > > ""John Green"" wrote in message > > > [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > > > > the IP address alloted by the dhcp server to my home > > > > computer (via cable ie cable modem connection) is > > > > > > > > IP address 24.15.125.255 > > > > subnet mask 255.255.248.0 > > > > def gw 24.15.125.1 > > > > > > > > ok look ar the last quad .... it is 255 !!! > > > > i can't believe this. > > > > > > > > do you how this is possible ? 0 and 255 are rserved > > > > for network and broadcast addresses..... > > > > > > > > please email me asap........... ________________________________________________ Get your own "800" number Voicemail, fax, email, and a lot more http://www.ureach.com/reg/tag Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=24372&t=24238 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
