Does it actually matter?
1 point
*
I made a tool just for that: https://federation-checker.vercel.app/
This uses two things: https://fba.ryona.agency/?domain=lemm.ee and https://lemm.ee/instances (do replace βlemm.eeβ with whichever instance you want to check)
My tool is bugged, and lemm.ee does defederate instances, so be aware of that and maybe use what my tool uses instead of my tool if you want reliable output :)