The DSYNC record contains the name of the target and a port number, but no
indication of which flavor of DNS transport should be used to connect to that
port to deliver the NOTIFY. If the port is 53 then Do53 over UDP seems like a
reasonable choice, but if the port is 853 then it could be either DoT or DoQ.
if the port is 443 then presumably DoH would be used. if it's not one of
those... then plain DNS over UDP?
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