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BCP 222 sets out guidelines for using underscored DNS node names, which are 
important for any record that should not be mistakenly interpreted as an actual 
host. However, it doesn’t seem to set aside a name for private use, which would 
be particularly helpful for deduplicating RRsets.

As an example, draft-ietf-dnsop-svcb-https-11 suggests using AliasMode HTTPS 
records to maintain a separation of concerns. I’ve found this helpful myself, 
as it allows me to have the configuration for a web server and single onion 
service in one RRset, with each of the served hostnames aliasing to that.

However, that suggestion recommends using non-underscored TargetNames, which 
have the side-effect of incorrectly stating that the TargetName is itself an 
origin. It would make much more sense to alias to an underscored node name for 
this.

Upon looking into my options, however, I can’t find any standards-compliant way 
of actually doing that. The closest option is “_example”, which doesn’t seem 
meant for actual use. Am I missing something, or is it outright impossible to 
name arbitrary DNS records without the possibility that future specifications 
ascribe unwanted meaning to it?

If I am in fact not missing anything, I propose registering “_private” as a 
reserved node name for all RRTypes.
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