On Mon, Dec 14, 2020 at 03:04:55AM -0500, Viktor Dukhovni wrote:

Yes, RP is definitely correct, though far from widely used.  After
querying 10k domains of working DANE MX hosts, I found 51 zone-apex RP
RRsets.  We haven't marketed these terribly well... :-(

Anyway, they won't solve the problem you're talking about, because the way you 
often find out the domain has expired is that the registry puts the domain into 
Hold (which pulls the delegation) or else changed the delegation to their 
parking servers (which means the RP record won't be in the name servers you get 
when following the delegation).  So, only if you already know the 
expired-domain's original nameservers will you be able to find the RP record.

Note that whois from a registry often doesn't tell you when the domain will expire; just 
when the domain will expire in the registry.  Owing to the way most auto-renew policies 
work, the "real" expiry of the domain doesn't always show up in the registry.  
ICANN invented the registrar expiry date field to expose this difference, but it's only 
available from the registrar.  As WHOIS becomes useless due to GDPR and friends, and an 
unholy combination of LEO and IPR interests manages to prevent any consensus from 
emerging thatt will permit the replacement of WHOIS with a protocol actually suited to 
purpose, it becomes ever harder to find the data you need in responses.

Perhaps the true answer to all of this is DOIs, because of course another 
opaque numerical identifier that nobody can remember will save us all ;-)

A


--
Andrew Sullivan
a...@anvilwalrusden.com
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