This is to discover services, which you really shouldn't need to do by hand outside of troubleshooting, your apps should be doing it themselves.
For address discovery which is what we're really talking about here it's just "<hostname>.local"
I was answering the question of “how do I discover another host’s mDNS hostname?” It turns out that is a per-service question.
I was answering the question of “how do I discover another host’s mDNS hostname?” It turns out that is a per-service question.