Port 12345 can be used for various applications and services. It is not specifically assigned to any particular protocol or service by the Internet Assigned Numbers Authority (IANA). It can be used for custom or proprietary applications as well as for malware and cyber attacks. It is important to monitor any incoming and outgoing traffic on port 12345 and ensure that proper security measures are in place to prevent unauthorized access.
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 12345 | tcp | italk | Italk Chat System | REGISTERED PORT |
| Port 12345 | udp | italk | Italk Chat System | REGISTERED PORT |
UnOfficial
Unofficialy or sometimes with conflict, the same port may be used by different applications.
| Port | Protocol (TCP/UDP) | Description |
| Port 12345 | NetBus�remote administration tool (often Trojan horse). Also used by NetBuster. Little Fighter 2 (TCP). |