$dottedipaddress = '123.123.123.123';

$query = "SELECT IPAddress FROM ip_table WHERE IPAddress = '$dottedipaddress'";
$result = mysqli_query($mysqli,$query);


$stmtquery = "SELECT IPAddress FROM ip_table WHERE IPAddress = ?";
$stmt = mysqli_prepare($mysqli,$stmtquery);
mysqli_stmt_bind_param($stmt,'s',$dottedipaddress);
mysqli_stmt_execute($stmt);