Domain authority is scored on a scale of 1 to 100 (1 being the worst, 100 being the best) using an algorithm designed by Moz. Its logarithmic scale means that it’s much easier to improve your score if your domain authority is at a 20 or a 30 than if it was at a 70 or an 80.
Domain authority between 40 and 50 is considered average, between 50 and 60 is considered good and over 60 is considered excellent.
Rahul Gupta