Ip address validation in php

❮ PHP Filter Reference

Example

Check if the variable $ip is a valid IP address:

$ip = "127.0.0.1";

if (filter_var($ip, FILTER_VALIDATE_IP)) {
    echo("$ip is a valid IP address");
} else {
    echo("$ip is not a valid IP address");
}
?>

Try it Yourself »

Definition and Usage

The FILTER_VALIDATE_IP filter validates an IP address.

Possible flags:

• FILTER_FLAG_IPV4 - The value must be a valid IPv4 address
• FILTER_FLAG_IPV6 - The value must be a valid IPv6 address
• FILTER_FLAG_NO_PRIV_RANGE - The value must not be within a private range
• FILTER_FLAG_NO_RES_RANGE - The value must not be within a reserved range

More Examples

Example 1

Check if the variable $ip is a valid IPv6 address:

$ip = "2001:0db8:85a3:08d3:1319:8a2e:0370:7334";

if (filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6)) {
    echo("$ip is a valid IPv6 address");
} else {
    echo("$ip is not a valid IPv6 address");
}
?>

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❮ PHP Filter Reference

I want to check if an entered input is a valid IP address or not. I would like a specific function that will help me validate a users input.

hakre

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asked Jun 2, 2011 at 6:19

3

filter_var($ip, FILTER_VALIDATE_IP)

http://www.php.net/filter_var

Example:-

if(filter_var($ip, FILTER_VALIDATE_IP)){
  echo 'Valid IP';
} else {
  echo 'Not Valid IP';
}

user229044♦

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answered Jun 2, 2011 at 6:23

deceze♦deceze

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4

// Usually you'd get the value from $_POST or $_GET
$ip = "10.3.1.5";
if(!filter_var($ip, FILTER_VALIDATE_IP)) {
   echo "Not a valid IP address!";
}

You can modify this by filtering for IPv4 and IPv6 IP addresses and exclude private and reserved IPs.

http://www.php.net/manual/filter.filters.validate.php

answered Jun 2, 2011 at 6:26

chiborgchiborg

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By using preg_match();

function checkIPAddress($ipAddress) 
{
    return preg_match('/^(?:25[0-5]|2[0-4]\d|1\d\d|[1-9]\d|\d)(?:[.](?:25[0-5]|2[0-4]\d|1\d\d|[1-9]\d|\d)){3}$/', $ipAddress);
}

answered Aug 3, 2015 at 9:45

Aniket SinghAniket Singh

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1

$ip="255.255.47.12";
if(filter_var($ip,FILTER_VALIDATE_IP)){
echo " Correct , validation passed";
}else{
echo " Wrong , validation failed ";
}

To check IPV6 address ONLY, we can add optional flag like this

$ip='2002:0001:3238:DFE1:0063:0000:0000:FEFB'; //
if(filter_var($ip,FILTER_VALIDATE_IP,FILTER_FLAG_IPV6)){
echo " Correct ,   IP Validation passed ";
}else{
echo " Wrong , IP Validation failed ";
}

Output is

Correct , IP Validation passed

To check IPV4 address ONLY , we can add optional flag like this

$ip='2002:0001:3238:DFE1:0063:0000:0000:FEFB'; //
if(filter_var($ip,FILTER_VALIDATE_IP,FILTER_FLAG_IPV4)){
echo " Correct ,   IP Validation passed ";
}else{
echo " Wrong , IP Validation failed ";
}

Above validation will fail as we used FILTER_FLAG_IPV4 to check one IPV6 address.
Now let us try one IPV4 address.

$ip='127.0.0.0'; //Change this value to check different IP
if(filter_var($ip,FILTER_VALIDATE_IP,FILTER_FLAG_IPV4)){
echo " Correct ,   IP Validation passed ";
}else{
echo " Wrong , IP Validation failed ";
}

Output is here

Correct , IP Validation passed

No private range of IP is allowed by using Flag FILTER_FLAG_NO_PRIV_RANGE

$ip='10.0.0.0'; //Change this value to check different IP
if(filter_var($ip,FILTER_VALIDATE_IP,FILTER_FLAG_NO_PRIV_RANGE)){
echo " Correct ,   IP Validation passed ";
}else{
echo " Wrong , IP Validation failed ";
}

Output is

Wrong , IP Validation failed

No reserve range of IP address are allowed by using FILTER_FLAG_NO_RES_RANGE

$ip='169.254.0.0'; //Change this value to check different IP
if(filter_var($ip,FILTER_VALIDATE_IP,FILTER_FLAG_NO_RES_RANGE)){
echo " Correct ,   IP Validation passed ";
}else{
echo " Wrong , IP Validation failed ";
}

Output is

Wrong , IP Validation failed

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