There&#x27;s a <i>huge</i> suffix list that browsers use to control things like cookie scope:<p><a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Public_Suffix_List" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Public_Suffix_List</a><p><a href="https:&#x2F;&#x2F;publicsuffix.org&#x2F;" rel="nofollow">https:&#x2F;&#x2F;publicsuffix.org&#x2F;</a><p>Probably includes <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;List_of_Internet_top-level_domains" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;List_of_Internet_top-level_dom...</a>