Do I need help on the server?

Question

iptables

I need an ip blocker!
Server 606 port can only be connected to 1st IP address, the rest of the IP addresses should be automatically blocked. The first connected IP address came out on the server. The new connection ip address can connect the server.

606 port connected one ip address, others connected, they automatically block. And the first one turned off on the server, you need to allow other IP addresses. Only 1 IP address can be connected at a time on this port.

This problem can be solved in my opinion as follows:
Allow the first connected IP address to block the rest automatically. And 60 seconds later, this blocked ip address is removed automatically, and again the first connected ip address will allow the rest to be blocked automatically.

This is done on iptables or I need a separate script, I don’t know.