How to find running processes and their port number
The netstat command line utility displays protocol statistics and current TCP/IP network connections. If we want to display the associated process identifier (PID) of each process we add the -o parameter.
To filter the result we need to pipe to the Find utility and again, the result is text!. In PowerShell we can get the same information with the following command, however the process PID is missing and the connections in LISTENING state are not included by default.
PS > [System.Net.NetworkInformation.IPGlobalProperties]::GetIPGlobalProperties().GetActiveTcpConnections()
With the Get-NetworkStatistics function we can get the same information but each returned connection is an object. Get-NetworkStatistics parses only TCP/UDP connections (entries that starts with '[::' are ignored). Each connection is divided into two columns. For example, if the 'Local Address' column has a value of '0.0.0.0:80' the IP address will be shown in the LocalAddress property (e.g 0.0.0.0) and the port number in the LocalPort property (e.g 80). The name of each process is also added to the result. This should make filtering much more easier when we pipe the result to the Where-Object cmdlet, allowing us to filter on any property of a connection.
UPDATE1: Added support for IPv6 connections. @xcud and surveyor, thanks for the input!
UPDATE2: Per @xcud request (see comment below) I published an extended version of the function HERE.
function Get-NetworkStatistics
{
$properties = 'Protocol','LocalAddress','LocalPort'
$properties += 'RemoteAddress','RemotePort','State','ProcessName','PID'
netstat -ano | Select-String -Pattern '\s+(TCP|UDP)' | ForEach-Object {
$item = $_.line.split(" ",[System.StringSplitOptions]::RemoveEmptyEntries)
if($item[1] -notmatch '^\[::')
{
if (($la = $item[1] -as [ipaddress]).AddressFamily -eq 'InterNetworkV6')
{
$localAddress = $la.IPAddressToString
$localPort = $item[1].split('\]:')[-1]
}
else
{
$localAddress = $item[1].split(':')[0]
$localPort = $item[1].split(':')[-1]
}
if (($ra = $item[2] -as [ipaddress]).AddressFamily -eq 'InterNetworkV6')
{
$remoteAddress = $ra.IPAddressToString
$remotePort = $item[2].split('\]:')[-1]
}
else
{
$remoteAddress = $item[2].split(':')[0]
$remotePort = $item[2].split(':')[-1]
}
New-Object PSObject -Property @{
PID = $item[-1]
ProcessName = (Get-Process -Id $item[-1] -ErrorAction SilentlyContinue).Name
Protocol = $item[0]
LocalAddress = $localAddress
LocalPort = $localPort
RemoteAddress =$remoteAddress
RemotePort = $remotePort
State = if($item[0] -eq 'tcp') {$item[3]} else {$null}
} | Select-Object -Property $properties
}
}
}
Get-NetworkStatistics |
Format-Table 
To get all processes running on a local port 80:
Or find a connection information by filtering on ProcessName:
