Port 1234 is not reserved for any specific use, but is often used for non-standard purposes such as remote access and videoconferencing applications. It can also be used by some online multiplayer games.
Ports those registered with IANA are shown as official ports. The same port number may be unofficialy used by various services or applications. The official usage are listed separately below its usage may change from time to time.
Official
| Port | Protocol (TCP/UDP) | Title | Description | Port Type |
| Port 1234 | tcp | search-agent | Infoseek Search Agent | REGISTERED PORT |
| Port 1234 | udp | search-agent | Infoseek Search Agent | REGISTERED PORT |
UnOfficial
Unofficialy or sometimes with conflict, the same port may be used by different applications.
| Port | Protocol (TCP/UDP) | Description |
| Port 1234 | VLC media player Default port for UDP/RTP stream |