Listing 1:  EnumerateServers

The code on this page is oft published in the newsgroups and while I've used it for years, I've no idea who gets credit for it.  A search of Google Groups for the keyword "NetServerEnum" reveals numerous posts with similar code, but I found no author.  Other than leveraging the SQL-DMO library (which isn't installed on most usre's machines), there seems to be no other solution to the question of enumerating servers.

Paste the following code into a VB or VBA module and compile.  It was tested after having been formatted in this html page and worked when run from an Access 2003 code module.

Option Compare Database
Option Explicit

'* Server Type Definitions
Const SV_TYPE_WORKSTATION = &H1             '* All Net Workstations
Const SV_TYPE_SERVER = &H2                  '* All Net Servers
Const SV_TYPE_SQLSERVER = &H4               '* Any Server Running MS SQL Server
Const SV_TYPE_DOMAIN_CTRL = &H8             '* PDCs
Const SV_TYPE_DOMAIN_BAKCTRL = &H10         '* BDCs
Const SV_TYPE_TIMESOURCE = &H20             '* Servers running the TimeSource Service
Const SV_TYPE_AFP = &H40                    '* Apple File Protocol Servers
Const SV_TYPE_NOVELL = &H80                 '* Novell Servers
Const SV_TYPE_DOMAIN_MEMBER = &H100         '* LAN Manager 2.x Domain Member
Const SV_TYPE_PRINT = &H200                 '* Server sharing print queue
Const SV_TYPE_DIALIN = &H400                '* Server running dial-in service
Const SV_TYPE_XENIX_SERVER = &H800          '* Xenix server
Const SV_TYPE_NT = &H1000                   '* Windows NT (either Workstation or Server)
Const SV_TYPE_WFW = &H2000                  '* Server running Windows for Workgroups
Const SV_TYPE_MFPN = &H4000                 '* Microsoft File and Print for Netware
Const SV_TYPE_SERVER_NT = &H8000            '* Windows NT Non-DC server
Const SV_TYPE_POTENTIAL_BROWSER = &H10000   '* Server that can run the Browser service
Const SV_TYPE_BACKUP_BROWSER = &H20000      '* Server running a Browser service as backup
Const SV_TYPE_MASTER_BROWSER = &H40000      '* Server running the master Browser service
Const SV_TYPE_DOMAIN_MASTER = &H80000       '* Server running the domain master Browser
Const SV_TYPE_WINDOWS = &H400000            '* Windows 95 or later
Const SV_TYPE_LOCAL_LIST_ONLY = &H40000000  '* Servers maintained by the browser
Const SV_TYPE_DOMAIN_ENUM = &H80000000      '* Primary Domain
Const SV_TYPE_ALL = &HFFFFFFFF              '* All servers

'* Server Data Structure used for this function
    lgSvi100_platform_id As Long
    lgSvi100_servername As Long
End Type

'* Declare the NetAPI function
Declare Function NetServerEnum Lib "NetAPI32.DLL" (btComputerName As Byte, _
ByVal lgLevel As Long, anBuffer As Any, lgPreferedMaxLen As Long, _
lgEntriesRead As Long, lgTotalEntries As Long, anServerType As Any, _
btDomain As Byte, lgResumeHandle As Long) As Long

'* Declare the function to free the buffer
Declare Function NetAPIBufferFree Lib "NetAPI32.DLL" Alias _
"NetApiBufferFree" (ByVal lgPtr As Long) As Long

'* Declare the CopyMemory function
Declare Sub CopyMemory Lib "Kernel32" Alias "RtlMoveMemory" _
(anDest As Any, ByVal lgSrc As Long, ByVal lgSize As Long)

'* Declare the Array used to store the servernames
Public stServerArray() As String

Public Function EnumerateServers(stType As String) As String
On Error Resume Next

'* Enumerates Servers by Type Passed into function

Dim lgResult As Long
Dim lgTotalEntries As Long
Dim lgPrefMaxLen As Long
Dim lgEntriesRead As Long
Dim lgResumeHandle As Long
Dim stDomain As String
Dim lgBufPtr As Long
Dim lgServerType As Long
Dim btSrvArray(32) As Byte
Dim btDomain() As Byte
Dim btCompName() As Byte
Dim i As Integer
Dim stCompName As String
Dim stServerName As String
Dim stText As String
Dim ServerStruct As SERVER_INFO_100

    '* Clear values and initialize all of the variables
    lgResumeHandle = 0
    ReDim stServerArray(0) As String
    '* Set the domain to the default, primary domain
    stDomain = ""
    '* Set the computer name to the default, local system
    stCompName = ""

    '* Create Null Terminated Strings
    btDomain = stDomain & vbNullChar
    btCompName = stCompName & vbNullChar

    '* Determine stType Values and set servertype value
    '* You may add or remove these types as needed for your application
    If stType = "DCs" Then
        '* Enumerate Domain Controllers
    ElseIf stType = "SVs" Then
        '* Enumerate Servers
        lgServerType = SV_TYPE_SERVER
    ElseIf stType = "WKs" Then
        '* Enumerate Workstations
        lgServerType = SV_TYPE_WORKSTATION
    ElseIf stType = "ALL" Then
        '* Enumerate All Machines
        lgServerType = SV_TYPE_ALL
    ElseIf stType = "WFW" Then
        '* Windows for Workgroups Servers
        lgServerType = SV_TYPE_WFW
    ElseIf stType = "SQL" Then
        '* Servers running SQL Server
        lgServerType = SV_TYPE_SQLSERVER
    ElseIf stType = "NOV" Then
        '* Novell Servers
        lgServerType = SV_TYPE_NOVELL
        '* Select Default as all NT Servers
        lgServerType = SV_TYPE_SERVER + SV_TYPE_NT
    End If

    '* Call NetServerEnum to get a list of Servers
    lgResult = NetServerEnum(btCompName(0), 100, lgBufPtr, lgPrefMaxLen, _
    lgEntriesRead, lgTotalEntries, ByVal lgServerType, ByVal btDomain(0), _
    EnumerateServers = lgResult

    '* Now that we know how many entries were read, size the array
    If lgTotalEntries <= 0 Then
        MsgBox "No Entries Read. Error Code = " & CStr(lgResult)
        Exit Function
    End If
stServerArray(lgTotalEntries - 1) As String

    '* Check for errors
    '* 234 means multiple reads required
    If lgResult <> 0 And lgResult <> 234 Then  
        If lgResult = 2351 Then
            stText = "ServerName not found." & Chr$(13) & _
"Be sure you used the leading \\ on the servername."
            stText = "Error " & lgResult & " enumerating server " & _
                      lgEntriesRead & " of " & lgTotalEntries
        End If
        MsgBox stText
        Exit Function
    End If

    For i = 1 To lgTotalEntries
        '* Dereference the ServerStruct Data Structure
        CopyMemory ServerStruct, lgBufPtr, Len(ServerStruct)

        '* Dereference the server name variable
        CopyMemory btSrvArray(0), ServerStruct.lgSvi100_servername, 33
        stServerName = btSrvArray
        Trim (stServerName)

        '* send the servername to the array
        '* Change the code here to send the servername to a control, etc.

        Dim strServer As String
        Dim strallservers As String

        strServer = ExtractServerName(stServerName)
        strallservers = strallservers & ";" & strServer

        '* Clear the servername variable here
        stServerName = ""
        '* Move to the next part of the buffer
        lgBufPtr = lgBufPtr + Len(ServerStruct)
    Next i

    '* Release the memory used for the ServerStruct buffer
    lgResult = NetAPIBufferFree(lgBufPtr)

    EnumerateServers = strallservers

End Function

Private Function ExtractServerName(sName As String)
On Error Resume Next

Dim strExtractedServer As String
Dim i As Integer
Dim strChar As String * 1

    For i = 1 To 100
        strChar = Mid(sName, i, 1)
        If Asc(strChar) = 0 Then Exit For
    Next i
    strExtractedServer = Left(sName, i - 1)

    ExtractServerName = strExtractedServer

End Function