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Port 5452 services

2 entries are registered on port 545. 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
:545OSIsoft PI Server Client Accesscaution
:545appleqtcsrvrsafe

01OSIsoft PI Server Client Accesstcp · unofficial · risk 4/10

Port 545 is primarily used for communication between OSIsoft PI Servers and client systems. The PI System is a widely deployed industrial data management platform that collects, analyzes, visualizes, and shares large amounts of high-fidelity, time-series data from various sources including sensors, controllers, and SCADA systems. This port supports connectivity and data exchange between the PI Server infrastructure and client applications.

port 545 as OSIsoft PI Server Client Access →
filed underNetwork ServicesSystemIoT

Which one is on your host

ask the machine, not the registry

The registry says what 545 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 ':545\b'
macos
lsof -nP -iTCP:545 -sTCP:LISTEN
windows
netstat -ano | findstr :545

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 545 — 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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