Port 666 is often associated with the “doom” or “doom 2” first-person shooter video games. However, it is also used as an alternate port for Internet Relay Chat (IRC), a protocol used for real-time text messaging or online chatting.
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 666 | tcp | doom | doom Id Software | WELL KNOWN PORT |
Port 666 | udp | doom | doom Id Software | WELL KNOWN PORT |
Port 666 | tcp | mdqs | WELL KNOWN PORT | |
Port 666 | udp | mdqs | WELL KNOWN PORT |
UnOfficial
Unofficialy or sometimes with conflict, the same port may be used by different applications.
Port | Protocol (TCP/UDP) | Description |