(1.8 - 1.21.5) Java:
play.mc.stop.kim
Oddly, some clients don't resolve SRV records right.
Use port 33432 if you get connection resets or socket errors.

(1.21.70) Bedrock:
play.stop.kim:2489
here is a tutorial link on how to connect to coustom server on a console; you can either add a friend or change your dns

Or use the browser:
https://mcraft.fun
We add a 1-year cookie that saves the username
and auto-fill the server with ref tags.