Cara menggunakan validate ip address php

Last update on August 19 2022 21:50:37 (UTC/GMT +8 hours)

IP address validation

Every computer connected to the Internet is identified by a unique four-part string, known as its Internet Protocol (IP) address. An IP address consists of four numbers (each between 0 and 255) separated by periods. The format of an IP address is a 32-bit numeric address written as four decimal numbers (called octets) separated by periods; each number can be written as 0 to 255 (e.g., 0.0.0.0 to 255.255.255.255).

Example of valid IP address

  • 115.42.150.37
  • 192.168.0.1
  • 110.234.52.124

Example of invalid IP address

  • 210.110 – must have 4 octets
  • 255 – must have 4 octets
  • y.y.y.y – the only digit has allowed
  • 255.0.0.y – the only digit has allowed
  • 666.10.10.20 – digit must between [0-255]
  • 4444.11.11.11 – digit must between [0-255]
  • 33.3333.33.3 – digit must between [0-255]

JavaScript code to validate an IP address

function ValidateIPaddress(ipaddress) 
{
 if (/^(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$/.test(myForm.emailAddr.value))
  {
    return (true)
  }
alert("You have entered an invalid IP address!")
return (false)
}

Explanation of the said Regular expression (IP address)

Regular Expression Pattern :

/^(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$/

Character Description
/ .. / All regular expressions start and end with forward slashes.
^ Matches the beginning of the string or line.
25[0-5] Matches 250 or 251 or 252 or 253 or 254 or 255.
| or
2[0-4][0-9] Start with 2, follow a single character between 0-4 and again a single character between 0-9.
| or
[01]
? Matches the previous character 0 or 1 time.
[0-9][0-9] Matches a single character between 0-9 and again a single character between 0-9.
? Matches the previous character 0 or 1 time.
\. Matches the character "." literally.

Note: Last two parts of the regular expression is similar to above.

Syntax diagram - IP-address validation:

Cara menggunakan validate ip address php

Let apply the above JavaScript function in an HTML form.

HTML Code





JavaScript form validation - checking IP address/title>
<link rel='stylesheet' href='form-style.css' type='text/css' />
</head>
<body onload='document.form1.text1.focus()'>
<div class="mail">
<h2>Input an IP address and Submit</h2>
<form name="form1" action="#"> 
<ul>
<li><input type='text' name='text1'/></li>
<li> </li>
<li class="submit"><input type="submit" name="submit" value="Submit" onclick="ValidateIPaddress(document.form1.text1)"/></li>
<li> </li>
</ul>
</form>
</div>
<script src="ipaddress-validation.js"></script>
</body>
</html>
</code>
</pre><p><strong>JavaScript Code</strong></p></p><pre><code>function ValidateIPaddress(inputText)
 {
 var ipformat = /^(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$/;
 if(inputText.value.match(ipformat))
 {
 document.form1.text1.focus();
 return true;
 }
 else
 {
 alert("You have entered an invalid IP address!");
 document.form1.text1.focus();<br>return false;
 }
 }
</code>
</pre><p><strong>Flowchart: </strong></p><p><div class="imgBox"><img alt="Cara menggunakan validate ip address php" src="/dist/images/loading.svg" data-orgimg="https://sg.cdnki.com/cara-menggunakan-validate-ip-address-php---aHR0cHM6Ly93d3cudzNyZXNvdXJjZS5jb20vdzNyX2ltYWdlcy9qYXZhc2NyaXB0LWlwYWRkcmVzcy12YWxpZGF0aW9uLnBuZw==.webp"></img></div><br></p><p><strong>CSS Code</strong></p><pre><code>li {list-style-type: none;
font-size: 16pt;
}
.mail {
margin: auto;
padding-top: 10px;
padding-bottom: 10px;
width: 400px;
background : #D8F1F8;
border: 1px soild silver;
}
.mail h2 {
margin-left: 38px;
}
input {
font-size: 20pt;
}
input:focus, textarea:focus{
background-color: lightyellow;
}
input submit {
font-size: 12pt;
}
.rq {
color: #FF0000;
font-size: 10pt;
}
</code>
</pre><p>View the Javascript IP address validation in the browser</p><p>file_download
Download the validation code from here.</p><p><strong>Other JavaScript Validation:</strong></p></p><ul><li> Checking for non-empty</li><li> Checking for all letters</li><li> Checking for all numbers</li><li> Checking for floating numbers</li><li> Checking for letters and numbers</li><li> Checking string length</li><li> Email
Validation</li><li>Date Validation</li><li>A sample Registration Form</li><li>Phone No.
Validation</li><li>Credit Card No. Validation</li><li>Password Validation</li><li>IP address Validation</li></ul><p><strong>Previous: </strong> JavaScript : HTML Form validation - checking for password<br>
<strong>Next:</strong> JavaScript Cookies</p></article><p><h2>JavaScript: Tips of the Day</h2><p><strong>The unary operator</strong></p><pre>let num = 10;

const increaseNumber = () => num++;
const increasePassedNumber = number => number++;

const num1 = increaseNumber();
const num2 = increasePassedNumber(num1);

console.log(num1);
console.log(num2);
</pre><p>The unary operator ++ first returns the value of the operand, then increments the value of the operand. The value of num1 is 10, since the increaseNumber function first returns the value of
num, which is 10, and only increments the value of num afterwards.<br> num2 is 10, since we passed num1 to the increasePassedNumber. number is equal to 10(the value of num1. Again, the unary operator ++ first returns the value of the operand, then increments the value of the operand. The value of number is 10, so num2 is equal to 10.</p><p>Ref: https://bit.ly/323Y0P6</p><div class='paramage'></div> <div class="contenBreak"></div></p></div>
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