Assigned Port Numbers
This table lists the well-known port numbers in the range 0 to 1023, assigned and controlled by ICANN. Ports not mentioned in this list are currently unassigned.
| Keyword | Decimal | Description |
|---|---|---|
| 0/tcp | Reserved | |
| 0/udp | Reserved | |
| tcpmux | 1/tcp | TCP Port Service Multiplexer |
| tcpmux | 1/udp | TCP Port Service Multiplexer |
| compressnet | 2/tcp | Management Utility |
| compressnet | 2/udp | Management Utility |
| compressnet | 3/tcp | Compression Process |
| compressnet | 3/udp | Compression Process |
| rje | 5/tcp | Remote Job Entry |
| rje | 5/udp | Remote Job Entry |
| echo | 7/tcp | Echo |
| echo | 7/udp | Echo |
| discard | 9/tcp | Discard |
| discard | 9/udp | Discard |
| systat | 11/tcp | Active Users |
| systat | 11/udp | Active Users |
| daytime | 13/tcp | Daytime |
| daytime | 13/udp | Daytime |
| qotd | 17/tcp | Quote of the ... |
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