Common Port Reference

40+ ports, searchable

Quick Answer

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

Search port or service

40 of 40 entries

Port	Protocol	Service	Range class
20	TCP	FTP data	Well-known (0-1023, needs root)
21	TCP	FTP control	Well-known (0-1023, needs root)
22	TCP	SSH	Well-known (0-1023, needs root)
23	TCP	Telnet (legacy)	Well-known (0-1023, needs root)
25	TCP	SMTP	Well-known (0-1023, needs root)
53	TCP/UDP	DNS	Well-known (0-1023, needs root)
67	UDP	DHCP server	Well-known (0-1023, needs root)
80	TCP	HTTP	Well-known (0-1023, needs root)
110	TCP	POP3	Well-known (0-1023, needs root)
123	UDP	NTP	Well-known (0-1023, needs root)
143	TCP	IMAP	Well-known (0-1023, needs root)
443	TCP	HTTPS	Well-known (0-1023, needs root)
465	TCP	SMTPS	Well-known (0-1023, needs root)
587	TCP	SMTP submission	Well-known (0-1023, needs root)
993	TCP	IMAPS	Well-known (0-1023, needs root)
995	TCP	POP3S	Well-known (0-1023, needs root)
1080	TCP	SOCKS proxy	Registered (1024-49151)
1433	TCP	SQL Server	Registered (1024-49151)
1521	TCP	Oracle DB	Registered (1024-49151)
2049	TCP	NFS	Registered (1024-49151)
2375	TCP	Docker API (plain)	Registered (1024-49151)
2376	TCP	Docker API (TLS)	Registered (1024-49151)
3000	TCP	Dev servers	Registered (1024-49151)
3306	TCP	MySQL/MariaDB	Registered (1024-49151)
3389	TCP	RDP	Registered (1024-49151)
5000	TCP	Flask/dev	Registered (1024-49151)
5432	TCP	PostgreSQL	Registered (1024-49151)
5601	TCP	Kibana	Registered (1024-49151)
5672	TCP	RabbitMQ/AMQP	Registered (1024-49151)
6379	TCP	Redis	Registered (1024-49151)
6443	TCP	Kubernetes API	Registered (1024-49151)
8000	TCP	Django/dev	Registered (1024-49151)
8080	TCP	HTTP alt/proxy	Registered (1024-49151)
8443	TCP	HTTPS alt	Registered (1024-49151)
8888	TCP	Jupyter	Registered (1024-49151)
9092	TCP	Kafka	Registered (1024-49151)
9200	TCP	Elasticsearch	Registered (1024-49151)
11211	TCP	Memcached	Registered (1024-49151)
15672	TCP	RabbitMQ mgmt	Registered (1024-49151)
27017	TCP	MongoDB	Registered (1024-49151)

Checking ports in use

1Linux: ss -tlnp | grep :PORT (shows listening process); kill by PID
2Windows: netstat -ano | findstr :PORT → taskkill /PID xxx /F
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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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.

Related Guides

Source & Updates

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

Last updated: 2026-08-05

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

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.