Seeing it on your PC
In netstat, your side of almost every connection is a port in this range. That says nothing about the program: look at the remote end and the owning process instead.
Should you block it?
Never block the whole range. Judge each listener by the program that owns it.
Check it on your PC
Run this in PowerShell to see what is using port 49152 right now, and which program owns it:
Get-NetTCPConnection -LocalPort 49152 -ErrorAction SilentlyContinue | Select-Object LocalAddress,LocalPort,RemoteAddress,RemotePort,State,@{n='Process';e={(Get-Process -Id $_.OwningProcess -ErrorAction SilentlyContinue).ProcessName}}Get-NetUDPEndpoint -LocalPort 49152 -ErrorAction SilentlyContinue | Select-Object LocalAddress,LocalPort,@{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.