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Re: [DNSOP] Tell me about the ISO 3166 user assigned two-letter codes and TLDs

David Conrad <drc@virtualized.org> Thu, 29 September 2016 01:53 UTC

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Date: Wed, 28 Sep 2016 18:53:04 -0700
From: David Conrad <drc@virtualized.org>
To: John Levine <johnl@taugh.com>, dnsop@ietf.org
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Subject: Re: [DNSOP] Tell me about the ISO 3166 user assigned two-letter codes and TLDs
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John,

On September 28, 2016 at 4:27:51 PM, John Levine (johnl@taugh.com) wrote:

I don't think this has anything to do with RFC 6761, so ... 
I tend to agree, but it did get caught up in the 6761 maelstrom

For a very long time, two letter TLDs have been assigned to countries 
and other geographic entities per the ISO 3166 alpha-2 list. The 
earliest mention I can find is in RFC 920 in 1984, and even then the 
wording suggests that the usage was well settled. 

The codes AA, QM-QZ, XA-XZ, and ZZ are "user assigned" and will never 
be used for countries. Last year Ed Lewis wrote an I-D proposing that 
XA-XZ be made private use and the rest future use, but as far as I can 
tell it never went anywhere. 
6761 "discussions" sidetracked it I believe.

I've been telling people that if they need a fake private TLD for their local 
network they should use one of those since it is exceedingly unlikely 
ever to collide with a real DNS name. Am I right? 

I'd really like to say yes, but ISO-3166/MA appears to have removed references to "User Assigned" in their official ISO-3166 two letter code webpage. I'm trying to understand if they've changed their mind, but no answer yet.

Regards,
-drc

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