Just look at the pattern. A 'ringer' will have a normal looking pattern with white patches extending up the sides down near the cloaca, the best examples of ringers have a complete circle around the body (which is where they get the name from) This was often said to be a marker for het pieds along with the rails on the belly, however I've seen ringers in normals as well. Your snake has the pied pattern as well as the white patches, sure looks like a low white pied to me.