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Port 4122 services

2 entries are registered on port 412. It is a well-known port (0–1023) — assignments here are IANA's, and a service found on one is usually the service that was assigned it.

entries
2

services registered on this number

transport
tcp · udp

2 transports in use

in transit
0/2

entries encrypted on the wire

worst risk
4/10

1 of 2 iana-registered

Services on this port

ranked by lookups
portservicerisk
:412Direct Connect C2Ccaution
:412Synoptics Trapsafe

01Direct Connect C2Ctcp · unofficial · risk 4/10

Port 412 is primarily used for Direct Connect client-to-client (C2C) communications, facilitating peer-to-peer file sharing and messaging across users connected through Direct Connect hubs. It enables users to establish direct data transfers without routing traffic through centralized servers. This port plays a foundational role in the architecture of the Direct Connect protocol, known for enabling decentralized sharing of files and information.

port 412 as Direct Connect C2C →
filed underFile TransferNetwork Services

Which one is on your host

ask the machine, not the registry

The registry says what 412 is registered to. What is listening on it right now is decided by the host, and only the host can be asked. Each of these prints the process behind the socket.

linux
ss -ltnp | grep ':412\b'
macos
lsof -nP -iTCP:412 -sTCP:LISTEN
windows
netstat -ano | findstr :412

On Linux and Windows the process name comes back with the socket; on macOS lsof needs sudo to name a process that isn't yours. Match what it prints against the 2 entries above.

A port number is not a service. Anything may listen on 412 — what you actually met is decided by the host, not the registry. If a service is missing here, it belongs in the registry.

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