Tools - Find Open Ports

An open port is an active port that can receive data. A closed port is one that is not receiving or rejects data.  Different ports and their numbers are used for different purposes. For example, ports 3000 and 3030 are used by software developers while port 80 is used for web access. Think of ports as open windows in a locked house and the router as the main door.

Ports allow computers or devices to run multiple servers or applications.  After the application has used the ports, the ports become free. 

Identifying and closing open helps to minimize network vulnerabilities and improve security.  You can use Fing to find open ports. 

You need to close open ports through your router settings.  Refer to your router documentation or contact your ISP if you need help closing open ports.

Network Security and Open Ports

Open ports can impact the confidentiality, integrity, availability, and security of your organization/setup:

• Confidentiality: Open ports and the programs listening and responding to them, can reveal information about the system or network architecture. Open ports can leak banners, software versions, content, the existence of the system itself, and what type of system it is.
• Integrity: Without open port controls, software can open any candidate port and immediately communicate unhindered. This is often relied upon for legitimate programs, as well as different types of malware.
• Availability: Your network and the services running on open ports still process incoming traffic, even if the requests are invalid. This can result in denial of service (DoS) attacks.
• Security Risk:  Unwanted access can find its way through existing routing devices. Any application on a device may request that the router opens a port on its behalf to contact an entity outside of your local network.

Find Open Ports (Fing Desktop)

Identifying and closing open helps to minimize network vulnerabilities and improve security.  You can use Fing to find open ports. Select Tools > Find Open Ports to find open ports.  You need to close open ports through your router settings.    Refer to your router documentation or contact your ISP if you need help closing open ports.

Find Open Ports (Fing Mobile App)

• Open Fing Mobile.
• Click the Tools tab in the bottom toolbar.
• Click Find open ports under the heading Improve your network security. This will open the Find open ports page, where you can either enter a website or select the device on your network from the dropdown list.
• Click the blue Find open ports button.

The most common ports are:

• FTP (21)
• SSH (22)
• Telnet (23)
• SMTP (25)
• WHOIS (43)
• DNS (53)
• DHCP (67, 68)
• TFTP (69)
• HTTP (80)
• POP3 (110)
• SFTP (115)
• IMAP (143)
• SNMP (161)
• HTTPS (443)
• LPD (515)
• rsync (873)
• IMAP SSL (993)
• POP3 SSL (955)
• SOCKS (1080)
• Proxy (3128)
• MySQL (3306)
• RDP (3389)
• PostgreSQL (5432)
• VNC (5900)
• TeamViewer (5938)
• HTTP (8080)

Close Open Ports

It is not possible to close open ports from Fing.  You need to connect to the router and activate NAT PMP or UPnP, or a 3rd party app developed for PC or mobile.

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