How many clients are associated with the specified port number

Question

How to count all connections (clients) connected to the specified port on my (remote) server?

Suppose the port number is: 3306 (MySQL port), and how to calculate how many clients are connected to this port at the same time?

Answer 1

Listen, I know I'll do it on Linux: netstat -anp | grep ":3306.*ESTABLISHED" | wc -l netstat -anp | grep ":3306.*ESTABLISHED" | wc -l

I expect it to work on FreeBSD too ... let me know the result!