There&#x27;s a maximum of 63 characters for the so called &quot;label&quot;-part of a domain. <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Domain_Name_System#Label" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Domain_Name_System#Label</a><p>Edit: Example: <a href="http:&#x2F;&#x2F;63-characters-is-the-longest-possible-domain-name-for-a-website.com&#x2F;" rel="nofollow">http:&#x2F;&#x2F;63-characters-is-the-longest-possible-domain-name-for...</a>