Check Port Online

With Check Port Online, you can quickly check the status of any port from anywhere in the world. Our easy-to-use tool helps you identify any issues and troubleshoot problems in real-time.

Input IP Address or Domain to test port online

Introduction: offers a simple and easy-to-use tool to help you check if any port of a host or IP address is open or closed. This tool is particularly useful for network administrators and security professionals who need to ensure that their systems are secure and protected from unauthorized access. With this tool, you can quickly scan one or more ports of an IP address or domain to see if they are open or closed, without the need to install any software or know complex command-line tools.

How to use check port online:

Using the port checking tool is straightforward and can be done in just a few simple steps:

Open your web browser and go to the website.

  1. Find: Check port tool
  2. Enter the IP address or domain that you want to scan.
  3. Next, enter the port numbers that you want to check, separated by commas. You can enter a single port number or a range of ports. For example, you can enter "80, 443" to check ports 80 and 443
  4. Click the "Scan" button to start the scan.
  5. Wait for the tool to complete the scan, which should take just a few seconds. The tool will display a list of the ports that it has checked, along with their status (open or closed).
  6. If any ports are found to be open, you may want to investigate further to determine if there are any security risks associated with these open ports.

Most Commonly Used Ports

We have a list of common ports used for various network protocols along with their respective names. Let's take a look at each one:

  1. FTP (File Transfer Protocol): uses ports 20 and 21 for data and control, respectively, to transfer files between hosts.
  2. Telnet: uses port 23 for remote access to a command-line interface.
  3. SMTP (Simple Mail Transfer Protocol): uses port 25 to send and receive email messages.
  4. DNS (Domain Name System): uses port 53 to translate domain names into IP addresses and vice versa.
  5. DHCP (Dynamic Host Configuration Protocol): uses ports 67 and 68 for assigning IP addresses to hosts on a network.
  6. SNMP (Simple Network Management Protocol): uses ports 161 and 162 for monitoring and managing network devices.
  7. NTP (Network Time Protocol): uses port 123 to synchronize the time of a host with a time server.
  8. IMAP (Internet Message Access Protocol): uses ports 143 and 993 for accessing and managing email messages on a remote server.
  9. POP3 (Post Office Protocol version 3): uses ports 110 and 995 for retrieving email messages from a remote server.
  10. SMB (Server Message Block): uses ports 137-139 and 445 for file and printer sharing on a Windows network.
  11. LDAP (Lightweight Directory Access Protocol): uses ports 389 and 636 for accessing and managing directory services.
  12. AFP (Apple Filing Protocol): uses port 548 for file sharing on an Apple network.
  13. AFP over TCP: uses port 427 for directory services on an Apple network.
  14. MySQL: uses port 3306 for accessing and managing MySQL databases.
  15. RDP (Remote Desktop Protocol): uses port 3389 for remote access to a graphical desktop interface on a Windows host.
  16. VNC (Virtual Network Computing): uses port 5900 for remote access to a graphical desktop interface on a non-Windows host.
  17. PostgreSQL: uses port 5432 for accessing and managing PostgreSQL databases.
  18. Redis: uses port 6379 for accessing and managing Redis databases.
  19. Elasticsearch: uses port 9200 for accessing and managing Elasticsearch databases.

Understanding these ports and their corresponding protocols is important for network administrators and security professionals to ensure the security and proper functioning of their networks.

Notes when opening the port

When opening a port on a network, there are several important notes to consider:

  1. Only open the ports that are necessary: Open only the ports that are required for the specific applications or services you need to run on your network. Opening unnecessary ports increases the attack surface of your network and may expose it to unnecessary security risks.

  2. Use strong authentication and encryption: Whenever possible, use strong authentication mechanisms and encryption protocols to secure the communications that pass through open ports.

  3. Monitor network traffic: Regularly monitor network traffic to detect any suspicious or unauthorized activity, and take prompt action to investigate and mitigate any potential security incidents.

  4. Keep software up to date: Keep all software and systems up to date with the latest security patches and updates to minimize the risk of known vulnerabilities being exploited through open ports.

  5. Implement access controls: Implement access controls to restrict access to open ports to authorized users and devices only, and enforce strict password policies to prevent unauthorized access.

By following these guidelines, you can help to ensure that your network is secure and protected against potential security threats.