FILTER_VALIDATE_IP filter to validate IP address of IPv4 and IPV6 in PHP

Validate IPv4 and IPv6 addresses

FILTER_VALIDATE_IP validates IP-address syntax and supports flags when you specifically need IPv4, IPv6, or range restrictions.

$ip = '203.0.113.10';
var_dump(filter_var($ip, FILTER_VALIDATE_IP));

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

FILTER_VALIDATE_IP can be used to validate IP address ( both IPv4 and IPv6 ) . This filter id = 275. Here is the code.

Filter Flags	DESCRIPTION
FILTER_FLAG_IPV4	Only IPV4 formats are allowed
FILTER_FLAG_IPV6	Only IPV6 formats are allowed
FILTER_FLAG_NO_PRIV_RANGE	Private range of IPV4 & IPV6 are not allowed. IPV4 :10.0.0.0/8, 172.16.0.0/12 and 192.168.0.0/16 IPV6: Starting with FD or FC
FILTER_FLAG_NO_RES_RANGE	Reserved range of IPV4 & IPV6 are not allowed. IPV4 :0.0.0.0/8, 169.254.0.0/16, 127.0.0.0/8 and 240.0.0.0/4 IPV6: ::1/128, ::/128, ::ffff:0:0/96 and fe80::/10

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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Subhendu Mohapatra

Author & Instructor at plus2net

I write and maintain practical tutorials on Python, PHP, SQL, JavaScript, HTML, jQuery, and web development at plus2net. The tutorials focus on clear explanations, working examples, and code that readers can test and adapt while learning.

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