Tony,
On Nov 16, 2010, at 6:06 AM, Tony Finch wrote:
>> Note that .4u is still simply not allowed by RFC 1123 or by this
>> draft.
>
> According to my reading of RFC 1123 it is allowed,
1123 says:
"... However, a valid host name can never
have the dotted-decimal form #.#.#.#, since at least the
highest-level component label will be alphabetic."
Note that it says 'will be alphabetic' not 'will contain an alphabetic'. This
is, I presume, the rationale for 1*63(ALPHA) in the ABNF. I was suggesting that
this restriction will likely be revisited in the near future (but that's not to
say that this document shouldn't go forward).
Also, just speaking of current policy, 2-letter TLDs are restricted to what's
in the ISO-3166 list (or, to be pedantic, are in practice restricted to what's
listed as 'officially assigned', 'exceptionally reserved', or 'transitionally
reserved' code elements in http://www.iso.org/iso/iso-3166-1_decoding_table).
> and IDNA depends on it being allowed.
Sorry?
Regards,
-drc
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