[infogulch]

So a proper census would do a reverse dns lookup on every IP looking for a "minecraft" SRV record and connecting to that.

[ryukafalz]

That won’t get them all either, and likewise will only find one server per IP. The only really reliable way would be to scan every port to see if there’s a Minecraft server there, but that blows up the search space by quite a bit.

[duskwuff]

Reverse DNS lookups only return one designated name for the IP, not all records referencing the IP.