Getting the public IP in PHP — no dependencies, no API key

Getting the public IP in PHP — no dependencies, no API key PHP is still one of the most widely deployed server-side languages, running a significant share of the web's backend code. If you're building a PHP application that needs the public IP address — for geolocation, DDNS, diagnostics, or country detection — this article covers the common patterns using IPPubblico.org : free, no key, HTTPS, JSON and plain text endpoints. Use case 1 — Your server's own public IP (one-liner) The simplest case: a PHP script that needs to know its own public IP. <?php $ip = trim ( file_get_contents ( 'https://ipv4.ippubblico.org/' )); echo $ip ; // 203.0.113.42 file_get_contents works if allow_url_fopen is enabled (it is by default on most servers). If not, use cURL (see below). Use case 2 — With cURL (recommended for production) file_get_contents has no timeout control and minimal error handling. For production code, cURL is better: <?php function getPublicIP (): ?string { $ch = curl_init ( 'https://ipv4.ippubblico.org/' ); curl_setopt_array ( $ch , [ CURLOPT_RETURNTRANSFER => true , CURLOPT_TIMEOUT => 5 , CURLOPT_FOLLOWLOCATION => true , CURLOPT_SSL_VERIFYPEER => true , ]); $response = curl_exec ( $ch ); $httpCode = curl_getinfo ( $ch , CURLINFO_HTTP_CODE ); curl_close ( $ch ); if ( $response === false || $httpCode !== 200 ) { return null ; } return trim ( $response ); } $ip = getPublicIP (); echo $ip ?? 'Unavailable' ; Use case 3 — Full geolocation data When you need country, city, ISP and timezone in addition to the IP: <?php function getIPInfo ( ?string $ip = null ): ?array { $url = 'https://ippubblico.org/?api=1' ; if ( $ip !== null ) { $url . = '&ip=' . urlencode ( $ip ); } $ch = curl_init ( $url ); curl_setopt_array ( $ch , [ CURLOPT_RETURNTRANSFER => true , CURLOPT_TIMEOUT => 5 , CURLOPT_SSL_VERIFYPEER => true , ]); $response = curl_exec ( $ch ); $httpCode = curl_getinfo ( $ch , CURLINFO_HTTP_CODE ); curl_close ( $ch ); if ( $response === false || $httpCode !== 200 ) { retur