The global banlist is a shared record of accounts caught cheating anywhere on the Asphyxia network, so a cheater caught on another server cannot simply move to yours.
This page covers how the list is enforced on your server and how to control it. The dashboard side is on Global Banlist.
How it works
Bans issued on individual servers are reviewed by Asphyxia moderators, and those that clearly show cheating are added to the global list.
Your server downloads the list at startup. When a player connects, their identifiers are checked against it in the same way as your own bans, and a match is turned away with a ban card showing the ban is network-wide rather than yours.
A ban you issue stays local unless it has been submitted and accepted.
Turning it on and off
The list is controlled per server from the Global Banlist page. With it off, your server downloads and enforces nothing from it. Your own bans are unaffected.
Excluding a single ban
To use the list but ignore one entry, exclude that ban for your server on the same page. Excluded bans are filtered out before the list reaches you, so that player connects normally while other servers still keep them out.
What you will see
[Asphyxia.] › ✔ success Loaded 1892 ban(s) from the shared Asphyxia global banlist.If the list is disabled for your server, nothing is loaded and nothing is enforced.
Checking a player before they join
To check someone who has never connected, use Discord Lookup. It reports whether they are globally banned, banned on your server, and whether they have played with you before.