On: Why is DNS still hard to learn?

[labcomputer]

These all seem to be super-niche or obsolete though?

* ATMA, ISDN, NIMLOC, EID, X25, are all for relatively niche or obsolete physical layer protocols (I guess ATM isn't that niche, but most people never run into it).

* WKS, PX, NID, LP, L64, L32 seem to be defined but unused in practice (I had never even heard of ILNP, which what NID, LP, L64 and L32 are for, until I googled it just now).

* RKEY, NINFO, MINFO and several others are expired without adoption or never made it to an RFC

* GPOS is an earlier version of LOC

[teddyh → labcomputer]

> These all seem to be super-niche or obsolete though?

Yes, I wrote that in an edit soon after commenting; your comment was made hours after I made mine, so you should have seen it.

And, as I said, the SPF record, though obsolete, is still very commonly found, in my experience.