Domain authority is just as important as Google page rank. Here is a small list of some sites to check domain authority score of your website.
Domain Authority is provided by Seomoz, this metric is at domain level, it meaning that each url/page under one domain will return same value, unlike page authority which is url metric. Both of metrics use logarythmic value from 0 to 100 – meaning that more difficult to get value 30 from 20, like from 10 to 20. Higher value of domain authority meaning better ranked website of this domain in compare to others with same content, backlinks and other metric. – Quote from Moonsy