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more than 4 weeks ago
Ports are physical or virtual points of connection on a computer or network device that allow for communication between different devices or networks. They are used to transfer data between devices, such as computers, servers, and routers, and can be either physical ports, such as USB or Ethernet ports, or virtual ports, which are used in networking protocols to establish connections between devices. Ports are identified by numbers, known as port numbers, which help to route data to the correct destination.
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more than 4 weeks ago

Ports are logical endpoints in a computer network that allow data to flow between devices and applications.


- Well-known ports: Predefined port numbers assigned by the Internet Assigned Numbers Authority (IANA) to specific services or applications. Examples:
- Port 80: HTTP (web traffic)
- Port 443: HTTPS (secure web traffic)
- Port 25: SMTP (email)
- Port 22: SSH (secure remote login)
- Registered ports: Port numbers assigned to specific organizations or applications by IANA.
- Dynamic or private ports: Port numbers that are dynamically assigned by the operating system to applications for temporary use.


- Service identification: Ports allow devices to differentiate between different types of traffic, such as HTTP, FTP, and email.
- Endpoint mapping: Ports map an application or service to a specific IP address on a network interface.
- Security: Ports can be used for firewall rules to control incoming and outgoing connections, protecting systems from unauthorized access.
- Performance optimization: By assigning different ports to different services, network resources can be allocated more efficiently.

Port Forwarding:

Port forwarding is a technique that allows external connections to reach a specific port on a local network. This enables applications that require incoming connections to function properly behind a firewall or router.

Common Port Numbers:

- 21: FTP (File Transfer Protocol)
- 25: SMTP (Simple Mail Transfer Protocol)
- 80: HTTP (Hypertext Transfer Protocol)
- 443: HTTPS (Secure Hypertext Transfer Protocol)
- 53: DNS (Domain Name System)
- 67: DHCP (Dynamic Host Configuration Protocol)
- 139: SMB (Server Message Block)
- 1433: SQL Server
- 2087: HTTP/2 plaintext
- 2222: DirectAdmin Web Control Panel

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