Port Scanner Tool – Find open ports

The Port Scanner tool will assist you in finding open ports. Firstly, however, it is important to have an understanding of what ports are.

 

A bit about ports…

The use of ports allow computers/devices to run multiple services/applicationsA port number uses 16 bits and so can, therefore, have a value from 0 to 65535 decimal. If you have an open port, then it doesn’t mean it is dangerous, it means these are the ports through which anybody can try to connect to your network. You may wish to close these ports if you don’t use it. Different port and their numbers are used for different purposes like port 3000,3030 are used by software developers, port 80 is used by web access. Think of it as open windows in your locked house. These two open ports are acting as windows while the router is your main door.

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

  • Confidentiality: Open ports, and the programs listening and responding at them, can reveal information about the system or network architecture. They 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 attacks.

 

 

Port Scanner tool

When an application is using a service, it makes use of some ports and then after using it, that port becomes free. Once the port is not in use, the Fing App will let you know that the port is open and none of the applications is using it, thus advising you to close it.

 

Steps to use

On Fing Desktop:

  • Click on Tools from the navigation panel
  • Select the Find Open Ports

 

  • You will take you to a new page where you will have an option to either enter a website or select the device on your network from the dropdown list.
  • You can also change the ports scanned by the app. If you want to scan for all 65k ports or just the common ports.

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)

 

The final result will look similar to the picture below.

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