IPv64.net CDN64 ServersCDN64 forwards the visitors of your names through these servers to your Node64 at home. They are monitored by IPv64 and their status can be viewed by anyone here.
Your Node64 keeps a tunnel to these servers (outgoing, port 7844). Visitors of your CDN64 names reach the servers, and the servers pass them through the tunnel to your services – no open port at home is needed.
If a server is offline, its addresses are taken out of the DNS of your names automatically and the other servers take over.
To be on the safe side, you can add these addresses to your firewall whitelist if you restrict access to your services.