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Port Scanner

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Port Scanner is a free tool that helps you find open ports on your device with ease. It automatically finds your IP address and checks your device for open and unprotected ports that hackers, viruses, and Trojans could use to break into your system.

What is Online Port Scanner

What is Online Port Scanner

Open Ports Scanner, powered by nmap, checks your device to find system ports that might be open and at risk. Here's what it can do for you:

  1. The scanner quickly finds active system ports that are ready to send or receive data.
  2. By detecting open port activity, you can see what apps and services are running on your system.
  3. Port scanning is a simple way to help keep your device safe from hackers.

What is Network Ports

A network port serves as a communication endpoint that a system assigns to an application or service, allowing it to exchange data with other devices or hosts, and even with other programs on the same device. Each network port is identified by a number ranging from 0 to 65535. This port number, along with the IP address, is included in the packet header to direct the network traffic accurately. An application uses a port to either send out a request to or receive data from a corresponding open port on another device, facilitating the connection for the designated service.

What is Network Ports
Why Port Scanning Is Important

Why Port Scanning Is Important

Websites can scan locally open ports and detect which ports are opened on a computer to learn which programs the user is running. We learned that Facebook, eBay and Amazon all use such technical means.

In computer science, a port is a communication endpoint. When an application runs on a computer, it opens a port, which corresponds to the address through which the application interacts with other applications.

For example:

  1. TeamViewer will open ports: 80, 443 and 5938 (TCP)
  2. RDP (Remote Desktop Protocol) will open port: 3389 (TCP/UDP)

Through port scanning, the website can help determine whether the user has performed operations not allowed by the platform through remote control of the VPS and other means, thereby banning the account.

Common Ports

Our port scanner is designed to detect open ports that are commonly targeted by hackers. These ports are known points of entry that can be exploited for unauthorized access, data breaches, or to take control of devices. The Nmap database, a popular network security tool, lists the most frequently scanned ports by attackers. It's crucial to monitor and secure these ports to protect against potential intrusions.

Common Ports

Here's a table with explanations of each port and its common use:

  • 20,21-FTP
    Used for file transfers between systems
  • 22-SSH
    Secure shell access to remotely manage systems
  • 23-Telnet
    Unsecured text-based remote login service
  • 25-SMTP
    Standard protocol for email transmission
  • 53-DNS
    Domain Name System service for resolving names to IP addresses
  • 80-HTTP
    Standard protocol for web traffic
  • 110-POP3
    Protocol used by email clients to retrieve messages from server
  • 111-Rpcbind
    Service that maps RPC services to network ports
  • 135-MSRPC
    Microsoft Remote Procedure Call for networked client/server communication
  • 138-NetBIOS-DGM, trojan
    Used for network file sharing and known for vulnerabilities
  • 139-NetBIOS-SSN, trojan
    Another port for network file sharing and known for vulnerabilities
  • 443-SSL / HTTPS
    Secured web traffic via SSL/TLS encryption
  • 445-Microsoft-DS
    Used for Windows file and printer sharing and other services
  • 502-Modbus Protocol
    Communication protocol mainly used for industrial automation
  • 587-SMTP
    Alternative port for email transmission, often secured
  • 993-IMAPS
    Secure version of IMAP, using SSL/TLS encryption
  • 995-POP3S
    Secure version of POP3, using SSL/TLS encryption
  • 1080-Socks-proxy
    Port for SOCKS proxy servers
  • 1723-PPTP
    Point-to-Point Tunneling Protocol for VPNs
  • 2525-SMTP
    Another alternative port for SMTP, used when others are blocked
  • 3124-Beacon-port
    Known for being used by certain malware
  • 3127-Proxy
    Commonly used for proxy servers and anonymizing services
  • 3128-Proxy
    Another port often associated with proxy services
  • 3306-MySQL
    Default port for MySQL database server
  • 3389-MS WBT Server
    Used for Microsoft Remote Desktop (RDP)
  • 5000-Trojan
    Known to be used by some trojans and malicious software
  • 5900-VNC
    Used for Virtual Network Computing (remote desktop software)
  • 8080-HTTP-Proxy
    Often used as an alternate port for web traffic

Regarding the issue of network ports

Regarding the issue of network ports

What is the difference between TCP and UDP ports?

TCP (Transmission Control Protocol) ports ensure reliable data transmission, guaranteeing that information arrives in the correct order and undergoes error checking. Conversely, UDP (User Datagram Protocol) ports prioritize enhancing data transmission speed, with less emphasis on data accuracy. Therefore, when an application requires rapid data processing, UDP is the more suitable choice, even if a small amount of data loss occurs.

How many ports does a computer have?

Computers possess thousands of ports, primarily divided into TCP and UDP ports. Each port is distinguished by a specific numerical range to differentiate various services or applications, ensuring the accurate transmission and reception of data.

What is port forwarding or mapping?

Port forwarding or mapping is a technology in networking that allows external devices to connect into a local network, accessing services set up in a private network. In home networks, this function is often used to enable access from external networks to in-home devices such as security cameras and gaming consoles.

What is a custom port?

Custom ports are user-defined port numbers, utilized for targeted scanning of specific ports. This feature proves highly beneficial when there is a need to inspect a particular port for reasons such as security checks or troubleshooting.

Is it safe to keep port 80 open?

Keeping port 80 open is not inherently dangerous, but it can be exploited without proper security measures. Unlike port 443 that uses HTTPS encryption, port 80 is unencrypted, making it susceptible to interception and manipulation by cybercriminals.

Does an open port pose a security threat?

Indeed, open ports can pose a security risk if not adequately protected. They could potentially serve as conduits for illicit hacker intrusions. Therefore, vigilant monitoring and fortification of open ports is crucial for ensuring network security.

How to ensure the security of open ports in a network?

To ensure the security of open ports in the network, you may adopt the following measures:

  • Utilizing firewalls to monitor and manage the ingress and egress of network traffic.
  • Regularly update software to promptly patch security flaws.
  • Implement stringent access control and authentication procedures.
  • Promptly close unnecessary ports to mitigate potential security risks.

Is it possible to close the open ports on the computer?

Of course, you can close unnecessary ports by adjusting firewall settings or network configurations to limit external access. This can effectively reduce the risk of unauthorized access or cyber attacks.