3v4l.org

run code in 300+ PHP versions simultaneously
<?php echo 'remote addr: '.$_SERVER['REMOTE_ADDR'].'<br>'; $details = gethostbyaddr($_SERVER['REMOTE_ADDR']). print_r(dns_get_record(gethostbyaddr($_SERVER['REMOTE_ADDR'])),true); echo $details; ?>

preferences:
40.87 ms | 402 KiB | 5 Q