[Pdns-users] Re: Domains with binary (e.g. UTF-8) labels

bert hubert bert.hubert at netherlabs.nl
Sat Dec 16 21:56:16 UTC 2006

On Sat, Dec 16, 2006 at 10:37:05PM +0100, Stephane Bortzmeyer wrote:

> IDN is mandatory for host names but should not be for domain names
> without hosts.

People generally use DNS for host names these days.

However, I'll make sure we'll remove this restriction in due time, even
though there is little practical use for non-host use of DNS today.

It also requires some work on the database side of things, as for example
PostgreSQL is fond of interpreting 'VARCHARs' as UTF-8, which a random label
very often is not.

Thanks for pointing out the 'authoritative' reference in RFC 2181, I didn't
know it was this clear on 8-bit.

Julian, you might want to open a ticket on wiki.powerdns.com to remind us.
It tends to work.

> * most domain names contain host names and host names indeed do have
> the restriction (RFC 1123). That's also the reason why all the domain
> registries I know of prevent non-LDH labels registration (LDH =
> letters/digits/hyphen).

Many registries also demand silly things, like authority records - I think
many of them are just being anal. .fr not being one of them though :-)


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