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IP Number to IP address

Posted on 2006-11-16
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Last Modified: 2008-01-09
I need a function that converts ip numer into IP address.

ipnum = 16777216*w + 65536*x + 256*y + z
where
IP Address = w.x.y.z
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Question by:mxpoint
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Accepted Solution

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bchoor earned 125 total points
ID: 17963112
I'm pretty sure there are several other ways this can be done --

you can just shift, multiply and subtract

w = ipnum >> 24
ipnum = ipnum - (w * 2^24)
x = ipnum >> 16
ipnum = ipnum - (x * 2^16)
I posted an example at the bottom of this post
and so forth

or Maybe something like this
    Public Function IpNumberToIpAddress(ByVal IpNumber As Int64) As Integer()
        Dim IpAddress As New ArrayList

        For Each m As Match In Regex.Matches(IpNumber.ToString("x0").ToUpper(), "[\dA-F]{2}")
            IpAddress.Add(CType("&H" & m.Value, Integer))
        Next

        Return IpAddress.ToArray(GetType(System.Int32))
    End Function

Usage:
?IpNumberToIpAddress(3232235521.0)
{Length=4}
    (0): 192
    (1): 168
    (2): 0
    (3): 1


    Public Function IpNumberToIpAddress2(ByVal IpNumber As Int64) As Integer()
        Dim IpAddress As New ArrayList
        Dim v As Integer = 0

        v = IpNumber >> 24
        IpAddress.Add(v)
        IpNumber = IpNumber - (v * 2 ^ 24)

        v = IpNumber >> 16
        IpAddress.Add(v)
        IpNumber = IpNumber - (v * 2 ^ 16)

        v = IpNumber >> 8
        IpAddress.Add(v)
        IpNumber = IpNumber - (v * 2 ^ 8)

        v = IpNumber
        IpAddress.Add(v)

        Return IpAddress.ToArray(GetType(System.Int32))
    End Function
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