Port 104 is used for communication between the server and the client in the DICOM (Digital Imaging and Communications in Medicine) protocol. This protocol is widely used in the medical industry for the transfer of medical images and related data between medical devices and systems.
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 104 | tcp | acr-nema | ACR-NEMA Digital Imag. Comm. | WELL KNOWN PORT |
| Port 104 | udp | acr-nema | ACR-NEMA Digital Imag. Comm. | WELL KNOWN PORT |
UnOfficial
Unofficialy or sometimes with conflict, the same port may be used by different applications.
| Port | Protocol (TCP/UDP) | Description |