how to check for opened ports on a wifi router

Question

I want to check remotely if a specific port is opened on a wifi router. How can I do that?

Do I need to set something on the router side?

I tried using telnet but I get Unable to connect to remote host.

Answer 1

Scan with PortScan your Router-IP. Think this should work for you.

Switch scan type to "Scan All Ports". In this case I simply scanned the local host. Change localhost to your Router IP.

Answer 2

On ubuntu: sudo apt-get install nmap; nmap -vv <router-ip>