Get your own PHP server Result Size: 625 x 565
x
 
<!DOCTYPE html>
<html>
<body>
<?php
// Variable to check
$ip = "127.0.0.1";
// Validate ip
if (filter_var($ip, FILTER_VALIDATE_IP)) {
  echo("$ip is a valid IP address");
} else {
  echo("$ip is not a valid IP address");
}
?>
</body>
</html>
127.0.0.1 is a valid IP address