Port 1643 is commonly used for the authentication and authorization process of Remote Authentication Dial-In User Service (RADIUS) servers. It is specifically used for the communication between a RADIUS client and a RADIUS server for authentication, authorization, and accounting of network 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 1643 |
tcp |
isis-ambc |
isis-ambc |
REGISTERED PORT |
Port 1643 |
udp |
isis-ambc |
isis-ambc |
REGISTERED PORT |
UnOfficial
Unofficialy or sometimes with conflict, the same port may be used by different applications.
Port | Protocol (TCP/UDP) | Description |