I never remember (old habits) but you can use netcat for testing open ports. (nc -z <host> <port>) Apple for example doesn't include telnet by default anymore

I never remember (old habits) but you can use netcat for testing open ports. (nc -z <host> <port>) Apple for example doesn't include telnet by default anymore as it's considered insecure so I end up brew install inetutils on my machines.