Port 1243 is used for the TCP protocol to serve the INFOTRIEVE-2 database retrieval system, which is no longer in use.
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 1243 | tcp | serialgateway | SerialGateway | REGISTERED PORT |
| Port 1243 | udp | serialgateway | SerialGateway | REGISTERED PORT |
UnOfficial
Unofficialy or sometimes with conflict, the same port may be used by different applications.
| Port | Protocol (TCP/UDP) | Description |