Visual Basic WMI Network Services
Obtaining Network Adapter Information using WMI
Posted:   Monday March 04, 2002
Updated:   Monday November 28, 2011
Applies to:   VB5, VB6
Developed with:   VB6, Windows XP
OS restrictions:   Windows NT, 2000, XP. See Prerequisites below.
Author:   VBnet - Randy Birch


Win32_NetworkAdapter: WMI Network Adapter Info
Win32_NetworkAdapterConfiguration: WMI Network Adapter Configuration
Windows Script Host is built into Microsoft Windows 98, 2000, ME and XP. If you are running Windows 95 or NT4, you can download Windows Script Host from the Microsoft Windows Script Technologies Web site at Some information is not returned on non-NT-based systems.

A reference set in Projects / References to the Microsoft WMI Scripting Library.

The Win32_NetworkAdapter WMI class represents a network adapter on a Windows system. See the Comments section below for a complete listing of properties returned from this class.

This demo and illustration only show some of the available information from the class. For a complete listing see the table in the Comments section below. Note that some systems may not return information in all class properties.

 BAS Module Code

 Form Code
To a form add a command button (Command1) and a listview (Listview1). Set a reference in Projects / References to the Microsoft WMI Scripting Library, and add the following to the form:

Option Explicit
' Copyright 1996-2011 VBnet/Randy Birch, All Rights Reserved.
' Some pages may also contain other copyrights by the author.
' Distribution: You can freely use this code in your own
'               applications, but you may not reproduce 
'               or publish this code on any web site,
'               online service, or distribute as source 
'               on any media without express permission.
'/* Below used for listview column auto-resizing
Private Const LVM_FIRST As Long = &H1000
Private Const LVM_SETCOLUMNWIDTH As Long = (LVM_FIRST + 30)
Private Const LVSCW_AUTOSIZE As Long = -1

Private Declare Function SendMessage Lib "user32" _
   Alias "SendMessageA" _
  (ByVal hwnd As Long, _
   ByVal wMsg As Long, _
   ByVal wParam As Long, _
   lParam As Any) As Long

Private Sub Form_Load()

   With ListView1
      .ColumnHeaders.Add , , "DeviceID"
      .ColumnHeaders.Add , , "MAC Addr"
      .ColumnHeaders.Add , , "Type"
      .ColumnHeaders.Add , , "Manufacturer"
      .ColumnHeaders.Add , , "Description"
      .View = lvwReport
      .Sorted = False
   End With
   Command1.Caption = "Get Adapter Info"

End Sub

Private Sub Command1_Click()

   Call wmiNetAdapterInfo
   Call lvAutosizeControl(ListView1)
End Sub

Private Sub lvAutosizeControl(lv As ListView)

   Dim col2adjust As Long

  '/* Size each column based on the maximum of
  '/* EITHER the columnheader text width, or,
  '/* if the items below it are wider, the
  '/* widest list item in the column
   For col2adjust = 0 To lv.ColumnHeaders.Count - 1
      Call SendMessage(lv.hwnd, _
                       LVM_SETCOLUMNWIDTH, _
                       col2adjust, _
                       ByVal LVSCW_AUTOSIZE_USEHEADER)

End Sub

Private Sub wmiNetAdapterInfo()

   Dim NetAdapter As SWbemObjectSet
   Dim na As SWbemObject
   Dim itmx As ListItem
  'must have error handler enabled, as all
  'adapters do not return all information
   On Local Error Resume Next
   Set NetAdapter = GetObject("winmgmts:").InstancesOf("Win32_NetworkAdapter")
   For Each na In NetAdapter
      Set itmx = ListView1.ListItems.Add(, , na.DeviceID)
      itmx.SubItems(1) = na.MACAddress
      itmx.SubItems(2) = na.AdapterType
      itmx.SubItems(3) = na.Manufacturer
      itmx.SubItems(4) = na.Description
End Sub
All information returned in the Win32_NetworkAdapter class (note that some systems may not return information in all class properties):
string AdapterType
uint16 AdapterTypeID
boolean AutoSense
uint16 Availability
string Caption
uint32 ConfigManagerErrorCode
boolean ConfigManagerUserConfig
string CreationClassName
string Description
string DeviceID
boolean ErrorCleared
string ErrorDescription
uint32 Index
datetime InstallDate
boolean Installed
uint32 LastErrorCode
string MACAddress
string Manufacturer
uint32 MaxNumberControlled
uint64 MaxSpeed
string Name
string NetConnectionID
uint16 NetConnectionStatus
string NetworkAddresses[]
string PermanentAddress
string PNPDeviceID
uint16 PowerManagementCapabilities[]
boolean PowerManagementSupported
string ProductName
string ServiceName
uint64 Speed
string Status
uint16 StatusInfo
string SystemCreationClassName
string SystemName
datetime TimeOfLastReset


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