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You'd have to go to the websites individually, view the source code (right click on their site > view source) and look for the rel="nofollow" in the link.
There are better ways if you're prepared to pay for other tools such as SEOMoz or Ahrefs.
Very simple dofollow is an HTML residence of the tag rel=”dofollow” which tell Look for crawlers to adhere to this weblink. While in no follow tag search engine bot do not adhere to that weblink.