What Does the 410 Error Code Mean and How Do I Fix It? or Getting a 410 Error Code – Is the Page Gone

410 = "we deleted this and we’re not sorry."

If it’s your site, peek at your server response headers (Chrome DevTools > Network tab). Maybe it’s a misconfigured CMS.

For tools, Lumar (formerly DeepCrawl) is great for spotting 410 errors before they wreck your SEO.