referencing IDNA2008 (and IDNA2003?)

Peter Saint-Andre stpeter at
Thu Oct 21 22:16:16 CEST 2010

On 10/21/10 1:58 PM, Andrew Sullivan wrote:
> On Thu, Oct 21, 2010 at 10:12:16AM -0700, =JeffH wrote:
>> 5.1.2.  Canonicalized host names
>>    A canonicalized host name is the string generated by the following
>>    algorithm:
>>    1.  Convert the host name to a sequence of NR-LDH labels (see Section
>> of [RFC5890]) and/or A-labels according to the
>>        appropriate IDNA specification [RFC5891] or [RFC3490] (see
>>        Section 6.3 of this specification)
>>    2.  Convert the labels to lower case.
>>    3.  Concatenate the labels, separating each label from the next with
>>        a %x2E (".") character.
> John had a remark about what "host name" means.  I just had a very
> cursory look, but I don't see a definition of host name or a reference
> to the relevant RFCs.  There's nothing in the above that decides
> whether a given string is in fact a host name, as far as I can tell.
> That might be ok; I don't know.
> So what _is_ "host name" supposed to mean in the above?  Is this the
> same as host name in RFC 952 as modified by RFC 1123?

That is my impression.

> I'd also suggest that you make a request to the DNS Directorate for a
> review (you're likely to get one anyway, but this way you get in the
> queue early).

Good idea -- the WG chair and document author were trying to tie up a
few loose ends before the Monday I-D cutoff first, so perhaps Jeff will
follow up on this item next week.


Peter Saint-Andre

-------------- next part --------------
A non-text attachment was scrubbed...
Name: smime.p7s
Type: application/pkcs7-signature
Size: 6105 bytes
Desc: S/MIME Cryptographic Signature
URL: <>

More information about the Idna-update mailing list