$MSSQLServerManager = New-Object 'Microsoft.SqlServer.Management.SMO.Server'
 
# Get SQL Availability Group Listener
$HostSQLAvailabilityGroupListener = @($MSSQLServerManager.AvailabilityGroupListeners)[0]
 
# Get SQL Availability Group Listener Properties
$HostSQLName = $HostSQLAvailabilityGroupListener.Name;
$HostSQLAvailabilityGroupListenerGuid = $HostSQLAvailabilityGroupListener.UniqueId;
$HostSQLIPAddresses = $HostSQLAvailabilityGroupListener.AvailabilityGroupListenerIPAddresses;
$HostSQLPortNumber = $HostSQLAvailabilityGroupListener.PortNumber;