What is the difference between TCP and UDP ports?

TCP is connection-oriented and guarantees ordered, reliable delivery, which suits web pages, email and databases. UDP is connectionless and faster but without delivery guarantees, which suits DNS lookups, time sync and streaming. Some services such as DNS use both.

What are well-known ports?

Well-known ports are the numbers from 0 to 1023 reserved by IANA for common services such as HTTP on 80 and HTTPS on 443. Ports 1024 to 49151 are registered ports, and 49152 to 65535 are dynamic or ephemeral ports used for temporary client connections.

What port does HTTPS use?

HTTPS uses TCP port 443, and plain HTTP uses port 80. Browsers default to these, which is why you rarely type a port in a normal web address.

What are the default database ports?

MySQL listens on 3306, PostgreSQL on 5432, Redis on 6379, MongoDB on 27017 and Microsoft SQL Server on 1433. These defaults are useful when configuring connections or firewall rules.

Which ports does email use?

SMTP submission uses 587 (or 25 for server-to-server), IMAP over TLS uses 993, and POP3 over TLS uses 995. Secure submission and retrieval prefer the TLS ports.

SSH uses TCP port 22 by default, and RDP (Windows remote desktop) uses 3389. Administrators sometimes move SSH to a non-standard port to reduce automated scanning.

Is anything I search sent to a server?

No. The full port list and the search both run entirely in your browser — nothing you type is uploaded anywhere.

Port Numbers Reference

Network ports — searchable reference

A grouped, searchable list of the network ports developers and sysadmins actually run into — for configuring servers, opening firewall rules, or debugging a connection. Each entry shows the port number, protocol (TCP or UDP), the service, and a plain-English description.

How it works

Ports are organised into groups — web, email, remote access, databases, networking and messaging — and the search box filters the whole list by number, service name or keyword instantly. Port numbers fall into three IANA ranges:

0–1023 — well-known ports (HTTP 80, HTTPS 443, SSH 22)
1024–49151 — registered ports (databases, app servers)
49152–65535 — dynamic / ephemeral ports for temporary client connections

Common ports

Port	Protocol	Service
22	TCP	SSH
80	TCP	HTTP
443	TCP	HTTPS
587	TCP	SMTP (submission)
993	TCP	IMAP over TLS
3306	TCP	MySQL
5432	TCP	PostgreSQL
6379	TCP	Redis
3389	TCP	RDP
53	TCP/UDP	DNS

Example

Searching 5432 jumps straight to the PostgreSQL row (TCP, the default database port), while typing mail surfaces the SMTP, IMAP and POP3 entries together.

Everything runs in your browser; nothing is uploaded.