Comment by bluejekyll

I don’t understand this:

  A, AAAA, TXT - set record

  A, AAAA - check key

  TXT - read value

Dynamic DNS supports all of these options directly. Why are additional records used for the key and value? IXFR could instead be used to check if a record is up-to-date rather than overloading A and AAAA in their meaning?

I’m probably missing something about how these records are meant to be used together. Is there a protocol doc available?