There are some projects out there that specifically try to replace netstat:
Assuming you are looking for a TCP, not UDP or different protocol it should show up, but you can try the above to see if it matches netstat output. I’ve used Get-NetTCPConnection to find SQL connections, something like:
Get-NetTCPConnection -RemotePort 1433 -State Established
It’s difficult to provide any additional insight unless you post what you are actually seeing in NETSTAT vs Get-NetTcpConnection.