Validation (IP Address)

Jay Bienvenu Nov 23, 2000

Verify the value of an IP address. Check for special cases such as "0.0.0.0" and "255.255.255.255". Cool!

The JavaScript Source: Forms: Validation (IP Address)

Simply click inside the window below, use your cursor to highlight the script, and copy (type Control-c or Apple-c) the script into a new file in your text editor (such as Note Pad or Simple Text) and save (Control-s or Command-s). The script is yours!!!

<!-- TWO STEPS TO INSTALL VALIDATION (IP ADDRESS):

1.  Copy the coding into the HEAD of your HTML document
  2.  Add the last code into the BODY of your HTML document  -->

<HEAD>

<!-- Begin
function verifyIP (IPvalue) {
errorString = "";
theName = "IPaddress";

var ipPattern = /^(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})$/;
var ipArray = IPvalue.match(ipPattern);

if (IPvalue == "0.0.0.0")
errorString = errorString + theName + ': '+IPvalue+' is a special IP address and cannot be used here.';
else if (IPvalue == "255.255.255.255")
errorString = errorString + theName + ': '+IPvalue+' is a special IP address and cannot be used here.';
if (ipArray == null)
errorString = errorString + theName + ': '+IPvalue+' is not a valid IP address.';
else {
for (i = 0; i < 4; i++) {
thisSegment = ipArray[i];
if (thisSegment > 255) {
errorString = errorString + theName + ': '+IPvalue+' is not a valid IP address.';
i = 4;
}
if ((i == 0) && (thisSegment > 255)) {
errorString = errorString + theName + ': '+IPvalue+' is a special IP address and cannot be used here.';
i = 4;
      }
   }
}
extensionLength = 3;
if (errorString == "")
alert ("That is a valid IP address.");
else
alert (errorString);
}
//  End -->
</script>

</HEAD>

<BODY>

<form>
IP Address:
<input size=15 name="IPvalue">
<input type="submit" value="Verify" onClick="verifyIP(IPvalue.value)";>
</form>

<p><center>
<font face="arial, helvetica" size"-2">Free JavaScripts provided<br>
by <a href="http://javascriptsource.com">The JavaScript Source</a></font>
</center><p>

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(1 comment)

Hi, Thanks. Could you please provide javascript which can validate 192.168.1.0/24 as well.

Haseeb Jul 18, 2012

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