North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: Registered Class C addresses
At 11:56 AM -0500 12/17/98, Peter Polasek wrote: >I apologize in advance if this is an ISP 101 question. Is there >any reasonable method for acquiring a registered Class C address >these days? ISPs have to start somewhere! Let me suggest rephrasing the question a bit. No one can get class A, B, or C addresses any longer, because the concept of "classful" addresses is dead. Address space allocation is on a CIDR block basis, where a class C would be equivalent to a /24, a class B to a /16, and a class A to an /8. If you need the equivalent of two class C blocks, your requirement is for a /23 CIDR block. A starting point is Hank Nussbacher's CIDR FAQ at http://www.ibm.net.il/~hank/cidr.html. We are opening a data center in England and need at >least 2 registered Class C addresses IP for the production network. >Last time I checked, subnetted class C registered addresses were >still available (within the Class A range), but pure Class C addresses >were not. We very strongly prefer to avoid subnetting addresses because >this becomes extremely difficult maintain when the network becomes large >(as this will). See RFC2050, the policy for address allocation. I doubt that any address registry would consider a request for address space that is not subnetted because it is inconvenient to maintain. Take a look at my tutorial at the last NANOG meeting, which is on the NANOG web site at http://www.nanog.org/mtg-9811/ppt/berk/index.htm. I describe some approaches to semi-automating ISP address space management. For a somewhat broader look, I've just published a book that deals with address justification and planning, _Designing Address Architectures for Routing & Switching_ (Macmillan Technical Publishing ISBN #1-57870-059-0). Major online and physical bookstores just started making it available, although Amazon is correcting the title. Cheers, Howard
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