Re: [dnsext] SRV prefix registry

>> A registry for "underscore names that have been registered" is
>> completely different. ...

> Willing to help edit/shepherd such a document if needed.

I have an old draft lying around that we can start with.

Sec 5.2 of RFC 6335 is the part that says that the service name prefixed 
by an underscore is the label that goes on a SRV record, and says that 
"the Service Label MUST be a service name as defined herein with an 
underscore prepended."

But other RFCs such as 3921, 4386, 5509, and 6186 define underscore labels 
to use as service names in SRV records, some of which don't match service 
names in the IANA service registry, so if you believe 6335, those names 
are now invalid, which probably would surprise the people using _pres and 
_im service labels.  I think they're all in other registries, so IANA 
knows about them, but they're still Service Labels.

R's,
John
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