On Fri, Jun 25, 2004 at 11:15:28AM +0530, A, Honne Gowda (Honne) wrote: > Hi All, > I am confuesd abt the validity of IP addresses... > > By convention or standard IP address are classiffied like Class > A(0-127),Class B(128-191) class C(192-223),class D(224-239) and Class E( > 240-247).. Lookup CIDR. Those classes arn't really used that way anymore. Some people have large assignments but they're hard to get. > My question here is : are the following IP addresses valid for assignment.. > If not why? > > 0.0.0.0 > 10.0.0.0 > 126.0.0.0 > 192.0.0.0 Anything with a 0 or 255 at the end should probably be avoided to prevent confusion with broadcast addresses. 10.x.x.x is a private address space defined by some RFC. The 0.0.0.0 is just not allowed, it would be confused with INADDR_ANY. The other two could be allocated as a block for a /24, though currently they are reserved. IOW, there is no technical reason (other than the 0.0.0.0 one) why they can't be allocated to a network. They just aren't for public use right now. -- Martijn van Oosterhout <kleptog@svana.org> http://svana.org/kleptog/ > Patent. n. Genius is 5% inspiration and 95% perspiration. A patent is a > tool for doing 5% of the work and then sitting around waiting for someone > else to do the other 95% so you can sue them.
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