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How to validate an IP address from 1.0.0.0 to 255.255.255.255


Posted Date: 03 May 2008    Resource Type: Code Snippets    Category: Validations
Author: Rekha Member Level: Gold    
Rating: Points: 0



The following code sample will help in validating an ip address
Public Function ValidIP(ByVal addr As String) As Boolean
'create our match pattern
Dim pat As String = "^([1-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])(\." & _
"([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])){3}$"
Dim check As New Text.RegularExpressions.Regex(pat)
'boolean variable to hold the status
Dim valid As Boolean = False
If addr = "" Then
valid = False
Else
valid = check.IsMatch(addr, 0)
End If
'return the results
Return valid
End Function



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