Ok You Math Wiz's...

I need some help on IP Address incrementation. I have a few ways to possibly do it but I'm not 100% sure.

One method would be to convert the IP address to a DWord list like here then increment the value by 1 then convert the dword back to IP? This seems to work but I'm not sure how to go about converting it to a dword and back again.

Another method would be shifting the bits (as my c++ buddy says to do) but I am not quite sure what he means.

Another way would be to use the Socket.Net.IPAddress.Address Int value but I don't understand how it increments..

3568844760 = 216.63.184.212
3568844761 = 217.63.184.212

Changing the latter value by 1 changes the first Quad, I don't understand that one bit..

Basically I just need to Step though a range of manually set IP addresses and I'm not sure just what would be the best way..

Cheers to the person who can help me out with this :)

Ok, I did a dirty one here. You can build this alot better I guess but I did it quick. I have no code to check if it is a valid IP and such, it just increments a IP if it is a valid IP, you probably get alot of different errors if not.

Hope it still helps....

The general idea I used was to split the IP into 4 parts and individually change each "byte" to a Hexadecimal digit pair. Then concatenate the 4, change to Long, increment, go back to hex, split it into 4 again, and transfer back to Byte and concatenate them as strings (with a dot between each "Byte").

Code:

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Private Function IncrementIP(ByVal IP As String) As String

    'LoopCounter
    Dim i As Integer

    'IP-strings array
    Dim s1() As String = Strings.Split(IP, ".")
    Dim s2(3) As String

    'Decimal values
    Dim d1 As Long
    Dim d2(3) As Long

    'Hexstring
    Dim h As String

    'Create Hexstring (pading string if hex-value has only 1 digit)
    For i = 0 To 3
        h += CStr(Hex(CByte(s1(i)))).PadLeft(2, "0")
    Next

    'Change from hex to long and increment
    d1 = "&H" & h
    d1 += 1

    'Change back from Decimal to hex
    h = Hex(d1)

    'Create new IP-string array
    s2(0) = Strings.Left(h, 2)
    s2(1) = Strings.Right(Strings.Left(h, 4), 2)
    s2(2) = Strings.Left(Strings.Right(h, 4), 2)
    s2(3) = Strings.Right(h, 2)

    'Convert to long
    For i = 0 To 3
        d2(i) = "&H" & s2(i)
    Next

    'Creat ne IP and return it
    Return CStr(d2(0)) & "." & CStr(d2(1)) & "." & CStr(d2(2)) & "." & CStr(d2(3))

End Function

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