I found code on the web that works fine. I added a routing at the en
to test the code.
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' Copyright ©1996-2009 VBnet, Randy Birch, All Rights Reserved.
' Some pages may also contain other copyrights by the author.
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' 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.
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Private Const WSADescription_Len As Long = 256
Private Const WSASYS_Status_Len As Long = 128
Private Const WS_VERSION_REQD As Long = &H101
Private Const IP_SUCCESS As Long = 0
Private Const SOCKET_ERROR As Long = -1
Private Const AF_INET As Long = 2
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
imaxudp As Integer
lpszvenderinfo As Long
End Type
Private Declare Function WSAStartup Lib "wsock32" _
(ByVal VersionReq As Long, _
WSADataReturn As WSADATA) As Long
Private Declare Function WSACleanup Lib "wsock32" () As Long
Private Declare Function inet_addr Lib "wsock32" _
(ByVal s As String) As Long
Private Declare Function gethostbyaddr Lib "wsock32" _
(haddr As Long, _
ByVal hnlen As Long, _
ByVal addrtype As Long) As Long
Private Declare Sub CopyMemory Lib "kernel32" _
Alias "RtlMoveMemory" _
(xDest As Any, _
xSource As Any, _
ByVal nbytes As Long)
Private Declare Function lstrlen Lib "kernel32" _
Alias "lstrlenA" _
(lpString As Any) As Long
Private Sub Command1_Click()
Text2.Text = GetHostNameFromIP(Text1.Text)
End Sub
Private Function SocketsInitialize() As Boolean
Dim WSAD As WSADATA
SocketsInitialize = WSAStartup(WS_VERSION_REQD, WSAD) = IP_SUCCESS
End Function
Private Sub SocketsCleanup()
If WSACleanup() <> 0 Then
MsgBox "Windows Sockets error occurred in Cleanup."
vbExclamation
End If
End Sub
Private Function GetHostNameFromIP(ByVal sAddress As String) As String
Dim ptrHosent As Long
Dim hAddress As Long
Dim nbytes As Long
If SocketsInitialize() Then
'convert string address to long
hAddress = inet_addr(sAddress)
If hAddress <> SOCKET_ERROR Then
'obtain a pointer to the HOSTENT structure
'that contains the name and address
'corresponding to the given network address.
ptrHosent = gethostbyaddr(hAddress, 4, AF_INET)
If ptrHosent <> 0 Then
'convert address and
'get resolved hostname
CopyMemory ptrHosent, ByVal ptrHosent, 4
nbytes = lstrlen(ByVal ptrHosent)
If nbytes > 0 Then
sAddress = Space$(nbytes)
CopyMemory ByVal sAddress, ByVal ptrHosent, nbytes
GetHostNameFromIP = sAddress
End If
Else
MsgBox "Call to gethostbyaddr failed."
End If 'If ptrHosent
SocketsCleanup
Else
MsgBox "String passed is an invalid IP."
End If 'If hAddress
Else
MsgBox "Sockets failed to initialize."
End If 'If SocketsInitialize
End Function
Sub test()
MsgBox (GetHostNameFromIP("192.168.1.30"))
End Sub
