Random Port Generator Online Tool

Features

Random Generation

Generate random port numbers within specified range

Batch Generation

Generate multiple ports at once, up to 100

No Duplicate Mode

Support generating non-duplicate random ports

Sorted Output

Optional sort display from small to large

Common Presets

Provide common port range quick selection

One-click Copy

Quick copy generated port results

Tutorial

1

Set Parameters

Set port range (minimum and maximum values), generation count, optionally whether to generate non-duplicate ports and whether to sort. Can also directly click common range preset buttons for quick selection.

2

Generate Ports

Click "Generate Random Port" button, system will randomly generate port numbers within specified range and display in result area.

3

Copy Use

Click "Copy Result" button to copy generated port numbers to clipboard, convenient to paste into code or configuration.

Use Cases

Service Development

Choose random listening ports for web services

Testing Debugging

Test environment port configuration and debugging

Game Development

Game server port allocation

Database

Database service port configuration

Network Configuration

Firewall and network device port planning

Cloud Services

Cloud server port security group configuration

Port Knowledge

What is Port Number?

In computer networks, port is a logical channel on host, used to distinguish different applications or network services. Port number is a 16-bit unsigned integer, range from 0 to 65535. When a computer runs multiple network services simultaneously, use port number to distinguish which service data should be delivered to.

Example: HTTP service usually uses port 80, HTTPS uses port 443, SSH uses port 22

What Categories are Port Numbers Divided Into?

Well-known Ports: 0-1023, uniformly allocated by IANA, used for standard services, such as HTTP(80), FTP(21), SSH(22).
Registered Ports: 1024-49151, can register to IANA for use, usually used for custom services.
Dynamic/Private Ports: 49152-65535, can be freely used, commonly used for temporary connections and client ports.

What's the Difference Between TCP and UDP Ports?

TCP (Transmission Control Protocol) and UDP (User Datagram Protocol) are two different transport layer protocols, each has independent port number space. That means TCP port 80 and UDP port 80 are two different ports. TCP is connection-oriented reliable transmission, used for web pages, file transfer; UDP is connectionless unreliable transmission, used for video streaming, online games.

FAQ

Q: Is random port generator free?

A: Completely free, no registration login needed, no usage limit, open webpage to use.

Q: What is the range of port numbers?

A: Port number is 16-bit unsigned integer, range is 0 to 65535, total 65536 available ports. 0-1023 are well-known ports, 1024-49151 are registered ports, 49152-65535 are dynamic/private ports.

Q: What range of ports should be chosen for development?

A: Recommend using ports above 1024, best in 3000-9999 or 49152-65535 range. Avoid using default ports of well-known services like 80, 443, 3306, 6379 to prevent conflicts.

Q: How to check if port is occupied?

A: Windows can use command netstat -ano | findstr "port_number"; Linux/Mac can use lsof -i :port_number or netstat -tulpn | grep port_number to check port occupation.

Q: How many ports can be generated at most?

A: This tool can generate up to 100 random ports at once. If checked "No Duplicate" option, generation count cannot exceed port range size.

Q: What are well-known default ports?

A: Common default ports: HTTP(80), HTTPS(443), FTP(21), SSH(22), Telnet(23), SMTP(25), DNS(53), MySQL(3306), Redis(6379), MongoDB(27017), Tomcat(8080).