[dns-operations] xn--

[Gihan Dias]

On 26/06/2025 09:02, jeffb wrote:
> Possibly a good place to start: 
> https://datatracker.ietf.org/doc/html/rfc3490
>
> Specifically Section 5.. though I have no idea how to register/who 
> controls ACE prefixes: 
> https://datatracker.ietf.org/doc/html/rfc3490#section-5

Jeff,

Thanks.

It doesn't discuss /why/ xn-- was chosen, though it does say:

    The ACE prefix, used in the conversion operations (section 4 <https://datatracker.ietf.org/doc/html/rfc3490#section-4>), is two
        alphanumeric ASCII characters followed by two hyphen-minuses.  It
        cannot be any of the prefixes already used in earlier documents,
        which includes the following: "bl--", "bq--", "dq--", "lq--", "mq--",
        "ra--", "wq--" and "zq--".

However, I couldn’t find a discussion of ACE prefixes, or how any of the 
above were selected.

Gihan
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