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Common Port Reference

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40+ ports, searchable

Quick Answer

Common Port Reference: 40+ ports, searchable. Common Port Reference uses standard developer formulas to compute accurate results instantly.

40 of 40 entries
PortProtocolServiceRange class
20TCPFTP dataWell-known (0-1023, needs root)
21TCPFTP controlWell-known (0-1023, needs root)
22TCPSSHWell-known (0-1023, needs root)
23TCPTelnet (legacy)Well-known (0-1023, needs root)
25TCPSMTPWell-known (0-1023, needs root)
53TCP/UDPDNSWell-known (0-1023, needs root)
67UDPDHCP serverWell-known (0-1023, needs root)
80TCPHTTPWell-known (0-1023, needs root)
110TCPPOP3Well-known (0-1023, needs root)
123UDPNTPWell-known (0-1023, needs root)
143TCPIMAPWell-known (0-1023, needs root)
443TCPHTTPSWell-known (0-1023, needs root)
465TCPSMTPSWell-known (0-1023, needs root)
587TCPSMTP submissionWell-known (0-1023, needs root)
993TCPIMAPSWell-known (0-1023, needs root)
995TCPPOP3SWell-known (0-1023, needs root)
1080TCPSOCKS proxyRegistered (1024-49151)
1433TCPSQL ServerRegistered (1024-49151)
1521TCPOracle DBRegistered (1024-49151)
2049TCPNFSRegistered (1024-49151)
2375TCPDocker API (plain)Registered (1024-49151)
2376TCPDocker API (TLS)Registered (1024-49151)
3000TCPDev serversRegistered (1024-49151)
3306TCPMySQL/MariaDBRegistered (1024-49151)
3389TCPRDPRegistered (1024-49151)
5000TCPFlask/devRegistered (1024-49151)
5432TCPPostgreSQLRegistered (1024-49151)
5601TCPKibanaRegistered (1024-49151)
5672TCPRabbitMQ/AMQPRegistered (1024-49151)
6379TCPRedisRegistered (1024-49151)
6443TCPKubernetes APIRegistered (1024-49151)
8000TCPDjango/devRegistered (1024-49151)
8080TCPHTTP alt/proxyRegistered (1024-49151)
8443TCPHTTPS altRegistered (1024-49151)
8888TCPJupyterRegistered (1024-49151)
9092TCPKafkaRegistered (1024-49151)
9200TCPElasticsearchRegistered (1024-49151)
11211TCPMemcachedRegistered (1024-49151)
15672TCPRabbitMQ mgmtRegistered (1024-49151)
27017TCPMongoDBRegistered (1024-49151)

Checking ports in use

  1. 1Linux: ss -tlnp | grep :PORT (shows listening process); kill by PID
  2. 2Windows: netstat -ano | findstr :PORT → taskkill /PID xxx /F
  3. 3EADDRINUSE means another process holds the port — either kill it or pick a dynamic-range port (49152+).
Security notes: databases (3306/5432/6379/27017) and Docker API (2375) must never be exposed to the public internet — bind to 127.0.0.1 or use firewalls/VPN. Telnet (23) and FTP (21) transmit credentials in plaintext; prefer SSH (22) and SFTP.

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How to Use

  1. Paste or type content: drop code/text into the Common Port Reference or fill the parameters.
  2. Choose mode/options: switch format, rules or processing as needed.
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  4. One-click copy: copy the output straight into your development environment.

Key Points

  • Common Port Reference is a free online developer tool — open and use, no sign-up.
  • All calculations run locally in your browser; your data never leaves the device.
  • Key capability: 40+ ports, searchable.
  • Results come with formulas and reference tables so you can verify every number.

Formula & How It Works

Common Port Reference formula

Common Port Reference uses standard developer formulas to compute accurate results instantly.

FAQ

How do I use the Common Port Reference?
Open the page and fill in the input fields — results update automatically. 40+ ports, searchable.
Are the results accurate?
Yes. Standard formulas and conversion factors are used and verified.
Is it free? Do I need to sign up?
Completely free. No registration, login or download required.
Does it work on mobile?
Yes. The responsive design works on phones, tablets and desktops.
Is my data saved?
No. Everything runs locally in your browser.

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Source & Updates

Based on RFC 4648, ECMA-262 and related specifications. Last updated: 2025-07

Last updated:

Formulas and content on this page are reviewed by the YiJianSuan team. For reference only — official sources prevail.

Maintained and periodically reviewed by the YiJianSuan editorial team — review process in ourEditorial Policy.

Cite this page: YiJianSuan. Common Port Reference[EB/OL]. https://www.yijiansuan.com/en/c/dev/port-list

Results provided by this tool are for reference only and do not constitute professional advice.