whatportis.com

Port 16662 services

2 entries are registered on port 1666. It is a registered port (1024–49151) — IANA records an assignee, but nothing stops other software from listening here, which is why the number carries more than one entry.

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
:1666Perforcecaution
:1666NetView for AIX 6safe

01Perforcetcp · unofficial · risk 4/10

Perforce is a version control system designed to handle large codebases and binary assets, widely used in large-scale software development and digital content creation. Operating primarily on port 1666 over TCP, Perforce facilitates efficient code collaboration, asset management, and change tracking across distributed teams. It supports branching, merging, access control, and integrations with various development tools, making it a crucial tool for enterprises and organizations requiring robust version control capabilities.

port 1666 as Perforce →
filed underFile TransferSystemCloudNetwork Services

Which one is on your host

ask the machine, not the registry

The registry says what 1666 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 ':1666\b'
macos
lsof -nP -iTCP:1666 -sTCP:LISTEN
windows
netstat -ano | findstr :1666

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 1666 — 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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