Enumerating Network Addresses

[amitabh]

How do I determine all the IP addresses present in my network?

[Babbalouie]

I have a solution, maybe not the BEST solution, but it would work. First, you'd have to get all the computers on the network:

Public Function GetComputersInADomain(aryUsers() As String) As Long

    'Notes:  Requires a global array to be pased in if list of users wanted
    'Notes:  Very slow if domain name not valid
    'Notes:  Must set reference to Active DS Type Library for this to work
    
Dim TheDomain As IADsDomain
Dim Computer As IADsComputer
Dim strDomain As String
Dim x As Long

    'Accept the Domain name
    strDomain = InputBox("Domain Name: ")

    'Use the WinNT Directory Services
    strDomain = "WinNT://" & strDomain

    'Create the Domain object
    Set TheDomain = GetObject(strDomain)

    'Search for Computers in the Domain
    TheDomain.Filter = Array("Computer")

    'Enumerate each computer in the domain
    For Each Computer In TheDomain
        x = x + 1
        ReDim Preserve aryUsers(x)
        aryUsers(x) = Computer.Name
    Next Computer

    'Clean up
    GetComputersInADomain = x
    Set Computer = Nothing
    Set TheDomain = Nothing

End Function

Part 2, getting the IP addresses, I'll send in a few moments...

[Babbalouie]

Once you do part 1, you will have a list of all the names in the domain. Pass each one of them into this bit of code, and it will return the IP address. The way this is written, it will only return one IP address at a time, but you could modify it to loop through all the computer names.

This will return the IP Address of another computer if you give the hostname. 




code:--------------------------------------------------------------------------------'Author: Waty Thierry
'Author's email: http://www.geocities.com/ResearchTriangle/6311/
'Date Submitted: 3/30/99
'Compatibility: VB 6,VB 5,VB 4/32

'Task: Find IP address ginving the hostname

'Declarations
' #VBIDEUtils#************************************************************
' * Programmer Name  : Waty Thierry
' * Web Site         : http://www.geocities.com/ResearchTriangle/6311/
' * E-Mail           : [email protected]
' * Date             : 13/10/98
' * Time             : 10:24
' * Module Name      : IP_Module
' * Module Filename  : IP.bas
' **********************************************************************
' * Comments         :
' * Find IP address ginving the hostname
' **********************************************************************

'Here's sample code for gethostbyname()

'Add a textbox (Text1) And a Command button (Command1) To a New form And use the
following code:

'Usage: Fill in the textbox with the name you want to resolve and click the
command button to resolve the name.

Private Const WS_VERSION_REQD = &H101
Private Const WS_VERSION_MAJOR = WS_VERSION_REQD \ &H100 And &HFF&
Private Const WS_VERSION_MINOR = WS_VERSION_REQD And &HFF&
Private Const MIN_SOCKETS_REQD = 1
Private Const SOCKET_ERROR = -1
Private Const WSADescription_Len = 256
Private Const WSASYS_Status_Len = 128

Private Type HOSTENT
   hName As Long
   hAliases As Long
   hAddrType As Integer
   hLength As Integer
   hAddrList As Long
End Type

Private Type WSADATA
   wversion As Integer
   wHighVersion As Integer
   szDescription(0 To WSADescription_Len) As Byte
   szSystemStatus(0 To WSASYS_Status_Len) As Byte
   iMaxSockets As Integer
   iMaxUdpDg As Integer
   lpszVendorInfo As Long
End Type

Private Declare Function WSAGetLastError Lib "WSOCK32.DLL" () As Long
Private Declare Function WSAStartup Lib "WSOCK32.DLL" (ByVal wVersionRequired&,
lpWSAData As WSADATA) As Long
Private Declare Function WSACleanup Lib "WSOCK32.DLL" () As Long
Private Declare Function gethostbyname Lib "WSOCK32.DLL" (ByVal hostname$) As
Long
Private Declare Sub RtlMoveMemory Lib "KERNEL32" (hpvDest As Any, ByVal
hpvSource&, ByVal cbCopy&)



'Code:
' #VBIDEUtils#************************************************************
' * Programmer Name  : Waty Thierry
' * Web Site         : http://www.geocities.com/ResearchTriangle/6311/
' * E-Mail           : [email protected]
' * Date             : 13/10/98
' * Time             : 10:24
' * Module Name      : IP_Module
' * Module Filename  : IP.bas
' **********************************************************************
' * Comments         :
' * Find IP address ginving the hostname
' **********************************************************************

Function hibyte(ByVal wParam As Integer)

   hibyte = wParam \ &H100 And &HFF&

End Function

Function lobyte(ByVal wParam As Integer)

   lobyte = wParam And &HFF&

End Function

Sub SocketsInitialize()

   Dim WSAD As WSADATA
   Dim iReturn As Integer
   Dim sLowByte As String, sHighByte As String, sMsg As String

   iReturn = WSAStartup(WS_VERSION_REQD, WSAD)

   If iReturn <> 0 Then
      MsgBox "Winsock.dll is not responding."
      End
   End If

   If lobyte(WSAD.wversion) < WS_VERSION_MAJOR Or (lobyte(WSAD.wversion) =
WS_VERSION_MAJOR And hibyte(WSAD.wversion) < WS_VERSION_MINOR) Then
      sHighByte = Trim$(Str$(hibyte(WSAD.wversion)))
      sLowByte = Trim$(Str$(lobyte(WSAD.wversion)))
      sMsg = "Windows Sockets version " & sLowByte & "." & sHighByte
      sMsg = sMsg & " is not supported by winsock.dll "
      MsgBox sMsg
      End
   End If

   If WSAD.iMaxSockets < MIN_SOCKETS_REQD Then
      sMsg = "This application requires a minimum of "
      sMsg = sMsg & Trim$(Str$(MIN_SOCKETS_REQD)) & " supported sockets."
      MsgBox sMsg
      End
   End If

End Sub

Sub SocketsCleanup()
   Dim lReturn As Long

   lReturn = WSACleanup()

   If lReturn <> 0 Then
      MsgBox "Socket error " & Trim$(Str$(lReturn)) & " occurred in Cleanup "
      End
   End If

End Sub

Sub Form_Load()

   SocketsInitialize

End Sub

Private Sub Form_Unload(Cancel As Integer)

   SocketsCleanup

End Sub

Private Sub Command1_click()
   Dim hostent_addr As Long
   Dim host As HOSTENT
   Dim hostip_addr As Long
   Dim temp_ip_address() As Byte
   Dim i As Integer
   Dim ip_address As String

   hostent_addr = gethostbyname(Text1)

   If hostent_addr = 0 Then
      MsgBox "Can't resolve name."
      Exit Sub
   End If

   RtlMoveMemory host, hostent_addr, LenB(host)
   RtlMoveMemory hostip_addr, host.hAddrList, 4

   ReDim temp_ip_address(1 To host.hLength)
   RtlMoveMemory temp_ip_address(1), hostip_addr, host.hLength

   For i = 1 To host.hLength
      ip_address = ip_address & temp_ip_address(i) & "."
   Next
   ip_address = Mid$(ip_address, 1, Len(ip_address) - 1)

   MsgBox ip_address

End Sub