Open Port Checker Online Tool

The open port check tool can help you to find out whether a web server is open to external Internet on a specific port, or find out whether your server's port forwarding rules are setup correctly. List of some Well Known Ports:

Wikipedia (Port): https://en.wikipedia.org/wiki/Port_(computer_networking)

List of common port numbers: https://en.wikipedia.org/wiki/List_of_TCP_and_UDP_port_numbers

import socket


def port_checker(ip_address_or_domain, port_number):
    sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    try:
        sock.connect((str(ip_address_or_domain), int(port_number)))
        return "PORT {0} is OPEN on '{1}'.".format(port_number, ip_address_or_domain)
    except Exception as e:
        print(str(e))
        return "PORT {0} is CLOSED on '{1}'.".format(port_number, ip_address_or_domain)
    finally:
        sock.close()


print(port_checker('coding.tools', 443))

-------------------
PORT 443 is OPEN on 'coding.tools'.
    

import java.io.IOException;
import java.net.Socket;

public class Port {
    public static boolean check_port(String ip_or_domain, int port) {
        try (Socket server = new Socket(ip_or_domain, port)) {
            System.out.println("Port " + port + " is OPEN on " + ip_or_domain);
            return true;
        } catch (IOException ignored) {
            System.out.println("Port " + port + " is CLOSED on " + ip_or_domain);
            return false;
        }
    }

    public static void main(String[] args) {
        boolean is_open = check_port("93.184.216.34", 443);
    }
}

-------------------
Port 443 is OPEN on 93.184.216.34