How can I identify the ISP associated with an IP address in PHP?

To determine the ISP of an IP address using IP2Location.io in PHP, you can use the IP2Location.io API to retrieve geolocation and related data.

  1. We'll assume that you have already installed PHP and we won't cover that here. You will also need a paid subscription to the Starter plan or higher. Subscribe now!
  2. Save the below code into a file called test.php on your computer.
    PHP 
    
<?php
$ch = curl_init();
$ip = '8.8.8.8';
$key = 'YOUR_API_KEY';
curl_setopt($ch, CURLOPT_URL, 'https://api.ip2location.io/?' . http_build_query([
	'ip' => $ip,
	'key' => $key,
	'format'  => 'json',
]));

curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
curl_setopt($ch, CURLOPT_TIMEOUT, 10);

$response = curl_exec($ch);
$curl_errno = curl_errno($ch);
$curl_error = curl_error($ch);
curl_close($ch);

if ($curl_errno > 0) {
	echo 'ERROR: ' . $curl_error . PHP_EOL;
}
else {
	$myobj = json_decode($response, true);
	
	if ($myobj !== null) {
		if (isset($myobj['error'])) {
			echo 'ERROR: ' . $myobj['error']['error_message'] . PHP_EOL;
		}
		else if (isset($myobj['isp'])) {
			echo 'The ISP for IP ' . $ip . ' is ' . $myobj['isp'] . '.' . PHP_EOL;
		}
		else {
			echo 'ERROR: The isp field requires a paid subscription to the Starter plan or higher.' . PHP_EOL;
		}
	}
	else {
		echo 'ERROR: Invalid JSON in response.' . PHP_EOL;
	}
}
  3. In the command line, run the below command.
    Bash 
    
php test.php

This script will output the ISP of specified IP address. Make sure to replace 8.8.8.8 with the IP address you want and replace YOUR_API_KEY to your own API key.

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