Check incoming request from port 443
$ netstat -an | grep 443
Check incoming request from port 443 with selected IP address
$ netstat -an | grep 443 | grep 103.173.93.2
Check incoming request from port 443 only ESTABLISHED connection
$ netstat -an | grep 443 | grep ESTABLISHED
Check number of incoming request from port 443
$ netstat -an | grep 443 | wc -l