Best use
Use it for a focused Common Ports task when a quick browser workbench is appropriate.
| Port | Protocol | Service | Use / note |
|---|---|---|---|
| 20 | TCP | ftp-data | FTP data transfer |
| 21 | TCP | ftp | FTP control |
| 22 | TCP | ssh | Secure Shell |
| 23 | TCP | telnet | Telnet; avoid on public networks |
| 25 | TCP | smtp | SMTP mail transfer |
| 53 | TCP/UDP | domain | DNS queries and zone transfer |
| 67 | UDP | bootps | DHCP server |
| 68 | UDP | bootpc | DHCP client |
Common TCP / UDP Port Reference
Search common service names, transport protocols, and port numbers. Search rows quickly with a compact table UI.
How to use this reference
Common Ports: Search by keyword, protocol, code, permission, extension, or command. Copy a single row or the filtered result set for notes, tickets, configuration checks, or documentation drafts.
Usage boundaries and result checks
Common Ports is for this task: Search common service names, transport protocols, and port numbers. It runs in the browser; start with a short, non-sensitive sample and confirm the behavior before processing more data.
Input
a keyword, code, extension, permission, header, or command name
Output
filterable reference rows that can be copied into notes
Before reuse
For Common Ports: Treat the table as a lookup aid. Confirm version-sensitive details in the linked official source before implementation. See the test method.