Does anybody know how to hide the IP of the server itself?

By default a player does not know the ip and port of the minecraft servers when you are using bungeecord.

 

Probably you forgot to remove the port forwarding of the servers behind the bungee.

 

Then describe the problem better.

Does someone joined a server without using your bungee server?

 

No such exploit exists at least not in the base software.

What people can do is port scanning your host's ip addresses and find the minecraft server through that way.

If your security concept relies on people not knowing the ip address / port, something is going wrong anyway. Please consult https://www.spigotmc.org/wiki/firewall-guide on how to properly secure your backend minecraft servers.

 

Hello, the only way is to hire one of these services
https://tcpshield.com/
https://www.x4b.net/

 

He does not want to hide the ip address of his bungeecord.

 

So this person’s question doesn’t make sense since the server’s IP isn’t public only bungee’s and usually the server’s IP usually uses local IP for added protection

 

OP, you need to firewall off your Spigot servers.

• If your Bungeecord and Spigot servers are on the same server: Firewall off the spigot servers ports
• If your Bungeecord and Spigot servers are on separate servers, to which you have SSH access: Add a firewall to only allow access to the spigot server ports from the Bungeecord server IP
• If you're using shared hosting: Install BungeeGuard

This is 100% wrong. Please stop shilling shit if you have no clue what's going on.