[LEAPSECS] Bulletin C and all that

[Peter Vince]

Fantastic - thanks guys!

     Peter

On 11 February 2015 at 13:11, Zefram <zefram at fysh.org> wrote:

> Peter Vince wrote:
> >Class E addresses?
>
> IPv4 address space is for some purposes divided into five classes:
> class A is 0.0.0.0/1, class B is 128.0.0.0/2, class C is 192.0.0.0/3,
> class D is 224.0.0.0/4, and class E is 240.0.0.0/4.  Classes A, B, and
> C form the unicast address space, originally with subnet sizes linked
> to the classes but now with no real class distinction.  Class D is the
> multicast address space.  Class E, apart from the limited-broadcast
> address 255.255.255.255, remains reserved for future use.
>
> The class terminology is technically obsolete, but still common.  See,
> for example, RFC 5735, which describes the 240.0.0.0/4 block as "formerly
> known as the Class E address space" and "reserved for future use".
> The current iteration of that standard, RFC 6890, doesn't even mention
> the classful terminology.
>
> >and mention of A, AAA, and AAAA means nothing to me :-(
>
> "AAA" would be a typo for "AAAA".  These are DNS resource record types.
> An A record contains an IPv4 address, and an AAAA record contains an
> IPv6 address.  IPv6 addresses are four times the size of IPv4 addresses,
> hence the name.  The fundamentals of the DNS are specified by RFC 1034
> and RFC 1035 (the latter including the A type), and the AAAA type is
> specified by RFC 3596.
>
> -zefram
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