Web servers (a service) listen to port 80, but that's just a standard, not a hard rule. You could configure any service to listen on any port. It's not about 'special packets' it's about 'dialing the right port number' to get the service you want. If your pseudo program has a vulnerability, then it can be attacked on the port it is assigned to
To scan Nmap ports on a remote system, enter the following in the terminal:. sudo nmap 192.168.0.1. Replace the IP address with the IP address of the system you’re testing. This is the basic format for Nmap, and it will return information about the ports on that system.. In addition to scanning by IP address, you can also use the following commands to specify a target: How to check if port is open on windows - Open Port Jun 06, 2017 How to List Open Ports in Firewalld – Linux Hint
INDUSTRIAL SEPARATION SYSTEMS & PROJECT PUMPING …
Open Port Check Tool - Open Port A port scanner is a tool that can be used to scan a range of ports. A more advanced or port checker can scan some address or even a full network searching for ports that are open. In computer security and hacking it is widely used to search for problematic open ports that suppose to be close or monitor. An open port is like an open door or a
How to check if port is open on windows - Open Port
SSH Penetration Testing (Port 22) - Hacking Articles Jan 11, 2020 Android Hacking with NMAP | exploit open ports and Jul 16, 2020 why can't hackers attack via well known ports that are Apr 08, 2008