Parsing IP address

Hi all,

Not sure how to output only the network portion (first three octets) of the IP address. And to eliminate the "IP" and "--" output part also. Just the first three octets of the IP.

PS C:\SCRIPTS\Alabama> function Get-NetworkConfig {
  Get-WmiObject Win32_NetworkAdapter -Filter 'NetConnectionStatus=2' |
    ForEach-Object {
      $result = 1 | Select-Object Name,IP
      $result.Name = $_.Name
      $config = $_.GetRelated('Win32_NetworkAdapterConfiguration')
      $result.IP = $config | Select-Object -expand IPAddress
      $result
    }

}
Get-NetworkConfig | where-object {$_.IP -match '172'} | Format-Table IP
# Get-NetworkConfig  | Format-Table IP

IP                                                                                                                                                                                                                    
--                                                                                                                                                                                                                    
172.18.202.113               

Thanks