They’re documented, but it’s a big and ever expanding list.
If we didn’t have a bazillion TLDs these days we’d be ok and everyone can carry on using .local or .lan and be happy that they’re not real TLDs. Now when anything could be a TLD because every word you’ve ever heard is a TLD, you don’t know if its real or not.
Oh no!
Anyway…
Been on Proxmox for a couple of years and it’s been great.