Ports 8530 and 8531 · TCP

Ports 8530 and 8531: WSUS (company Windows Update)

Windows Server Update Services, a company's own Windows Update server. 8531 is the HTTPS version.

Protocol: TCP
On Windows: svchost.exe (Windows Update)
Risk if open to the internet: Low

Seeing it on your PC

A work PC fetching updates from the company's WSUS server.

Should you block it?

Normal on a managed PC.

Check it on your PC

Run this in PowerShell to see what is using port 8530 right now, and which program owns it:

Get-NetTCPConnection -LocalPort 8530 -ErrorAction SilentlyContinue | Select-Object LocalAddress,LocalPort,RemoteAddress,RemotePort,State,@{n='Process';e={(Get-Process -Id $_.OwningProcess -ErrorAction SilentlyContinue).ProcessName}}

No output means nothing is using the port at the moment. For every connection at once, paste netstat -ano into the netstat explainer.