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I have created a function that I hope will validate an IP address sent to it. I have searched the site for one but I wasn't able to find one that was bullet-proof from all the ones I have run up against here. This one will not only validate that the values are in the right range, but will also tell you what Class the IP address falls under. It will check for the invalid number ranges, 0.xx.xx.xx or 127.xx.xx.xx for example, as well as for the reserved ranges above 239.xxx. I've seen a lot of attempts with RegEx but I didn't find one that would correctly validate that all 4 octets are within the valid IPv4 range, most will check to see if the values are above 255 or below 0 or contain anything that isn't a number, but that doesn't validate an IP address it just validates whether the numbers look right. This will spit back an error if there are any non-numeric characters in the string, or you send it an IP address with less than all 4 octets. Or if your IP address is outside the valid class A-D ranges. Please beat this function up as much as you can so that I can tell if I missed something, and if there's anyone out there that understands the IPv4 standards that this function misses, please let me know so I can fix it. Thanks for looking. Global $IPAddress = "192.168.0.122" $Return = _ValidIP($IPAddress) If $Return < 0 Then Switch @error Case 1 MsgBox(64, "", "Error in IP address." & @LF & "Error code is: 1 - IP address starts with an invalid number = 0, 127 , 169 or is > 239") Case 2 MsgBox(64, "", "Error in IP address." & @LF & "Error code is: 2 - one of the octets of the IP address is out of the range 0-255 or contains invalid characters") Case 3 MsgBox(64, "", "Error in IP address." & @LF & "Error code is: 3 - IP Address is not a valid dotted IP address (ex. valid address 190.40.100.20)") EndSwitch Else MsgBox(48, "", $IPAddress & " is a valid Class " & Chr(@error) & " IP address") EndIf ; #FUNCTION# ==================================================================================================================== ; Name...........: _ValidIP ; Description ...: Verifies that an IP address is a valid IPv4 address or not ; Syntax.........: _ValidIP($sIP) ; Parameters ....: $sIP - IP address to validate ; ; Return values .: Success - String containing IP Address in Hex, @error is ASC value of the Class of the IP address ; Failure - -1, sets @error ; |1 - IP address starts with an invalid number = 0, 127 , 169 or is > 239 ; |2 - one of the octets of the IP address is out of the range 0-255 or contains invalid characters ; |3 - IP Address is not a valid dotted IP address (ex. valid address 190.40.100.20) ; Author ........: BrewManNH ; Modified.......: ; Remarks .......: Class A networks can't start with 0.xx.xx.xx. 127.xx.xx.xx isn't a valid IP address range. 169.xx.xx.xx is reserved and is invalid ; and any address that starts above 239, ex. 240.xx.xx.xx is reserved and should never be used or seen out in "the wild". ; The address range 224-239 1s reserved as well for Multicast groups but can be a valid IP address range if you're ; using it as such. ; This will validate an IP address that is 4 octets long, and contains only numbers and falls within valid IP address values. ; Anything else sent to it should fail the test and return -1. ; Related .......: ; Link ..........: _GetIP ; Example .......: No ; =============================================================================================================================== Func _ValidIP($sIP) $Array = StringSplit($sIP, ".", 2) If Not IsArray($Array) Or UBound($Array) <> 4 Then Return SetError(3, 0, -1) $String = "0x" If $Array[0] <= 0 Or $Array[0] > 239 Or $Array[0] = 127 Or $Array[0] = 169 Then Return SetError(1, 0, -1) EndIf For $I = 0 To 3 If $Array[$I] < 0 Or $Array[$I] > 255 Or Not StringIsDigit($Array[$I]) Then Return SetError(2, 0, -1) EndIf $String &= StringRight(Hex($Array[$I]), 2) Next Switch $Array[0] Case 1 To 126 SetError(65) Return $String Case 128 To 191 SetError(66) Return $String Case 192 To 223 SetError(67) Return $String Case 224 To 239 SetError(68) Return $String EndSwitch EndFunc ;==>_ValidIP