7 min read
2026-01-22
A network port is a numeric identifier (0–65535) that specifies a particular application or service on a device. Ports operate on top of the TCP and UDP protocols.
| Range | Name | Purpose |
|---|---|---|
| 0–1023 | Well-known | Standard services (HTTP, FTP, SSH) |
| 1024–49151 | Registered | Registered applications |
| 49152–65535 | Dynamic | Temporary (ephemeral) ports |
| Port | Protocol | Service |
|---|---|---|
| 22 | TCP | SSH |
| 53 | TCP/UDP | DNS |
| 80 | TCP | HTTP |
| 443 | TCP | HTTPS |
| 25 | TCP | SMTP |
| 3306 | TCP | MySQL |
| 5432 | TCP | PostgreSQL |
| 3389 | TCP | RDP |
TCP — reliable delivery with acknowledgment. Used for web traffic, email, files.
UDP — fast delivery without acknowledgment. Used for DNS, video streams, games.
Find the port you need in the Port List.
See also: IP Calculator, Subnet Calculator