I have created a page where you can check live which instances of RetroBBS is currently online.
Find it here: solidstate.com.ar/bbsstatus/
BBS statuses are refreshed every hour.
If you’re a RetroBBS sysadmin and your BBS is not listed but want to be part of it, please leave a comment here with your data, or contact me via e-mail: info(at)solidstate.com.ar