/24 is ~0.000006% of whole ipv4 space (256 / 4294967296) /24 is ~0.000006% of whole ipv6 space (2^104 / 2^128) Regards Martin Hindley -----Original Message----- From: address-policy-wg-admin@ripe.net [mailto:address-policy-wg-admin@ripe.net] On Behalf Of michael.dillon@bt.com Sent: 03 December 2009 13:20 To: address-policy-wg@ripe.net Subject: RE: [address-policy-wg] RE: an arithmetic lesson
As I understand: Or not ?
I don't know. The simple fact is that a /24 block is the set of addresses that use the same prefix which is defined by a 24-bit netmask. That means, that all of the addresses in the block will have the same pattern in the first 24 bits. Asking how many /24 blocks can be carved out of the total numberspace is equivalent to asking how many unique patterns there are of 24 binary digits. It should be obvious that the number of unique patterns of 24 binary digits is the same regardless of whether you use the first 24 bits out of a total of 32, or the first 24 bits out of a total of 128. One single /24 block is the same percentage of the total numberspace regardless of whether the protocol is v4 or v6. --Michael Dillon