Cara menggunakan validate ip address php

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]?]$/

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

Syntax diagram - IP-address validation:

Let apply the above JavaScript function in an HTML form.

HTML Code

JavaScript form validation - checking IP address/title>




Input an IP address and Submit
 


 

 

JavaScript 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[];
return false;
 }
 }

Flowchart:

CSS 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;
}

View the Javascript IP address validation in the browser

file_download Download the validation code from here.

Other JavaScript Validation:

• Checking for non-empty
• Checking for all letters
• Checking for all numbers
• Checking for floating numbers
• Checking for letters and numbers
• Checking string length
• Email Validation
• Date Validation
• A sample Registration Form
• Phone No. Validation
• Credit Card No. Validation
• Password Validation
• IP address Validation

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