How do you

validate an IP Address? i'm sure .NET has something like that.

Umm

VB Code:

Private Sub ValidateIP(ByVal IP As Object)
 
        Try
            Dim IpObject As Object = Net.IPAddress.Parse(IP)
            If IpObject.ToString = Net.IPAddress.Parse(IP).ToString Then
                MessageBox.Show(IpObject.ToString + "  Valid IP Address")
            End If
 
        Catch ex As Exception
            MessageBox.Show("Invalid IP Address")
        End Try
    End Sub

Usage

VB Code:

1-valid IP
 ValidateIP("20.102.255.5")
 
2-Invalid
 ValidateIP("20.102.255.256")

Just to add a note:
In case you need to validate IPv6 you need to enable its support both in machine.config and in your OS.