Uptendr

UptendrBot

UptendrBot checks websites for the people who own them. An owner adds their site to Uptendr, and UptendrBot then checks that the site is up and that its pages load without errors.

If UptendrBot visits your site and you did not add it, someone else entered your address. Email [email protected] and we will stop the checks.

What it does

  • It only reads pages. It never fills in forms, signs in, buys anything or changes data.
  • It stays on the site the owner added and does not follow links to other sites.
  • It reports what it finds to the site's owner in Uptendr.

How to recognize it

Uptendr's checks come only from these two addresses, each with its own name in the user agent:

  • UptendrBot from 54.37.135.109. Uptime checks: asks for your homepage every few minutes. User agent: UptendrBot/1.0 (+https://uptendr.com/bot)
  • UptendrBrowser from 51.77.137.158. Browser checks: opens up to 25 pages in a real browser, once a day and when the owner asks. User agent: UptendrBrowser/1.0 (+https://uptendr.com/bot) Chrome/…

The addresses of UptendrBot are also published at /bot/ips.json.

Let it past Cloudflare

Cloudflare's bot protection can block UptendrBot. Uptendr then tells you that Cloudflare blocked the check, and it does not report your pages as broken. To let it in:

On the Free plan (Bot Fight Mode), add an IP Access rule. Firewall rules cannot skip Bot Fight Mode, but an IP Access rule can.

  1. In Cloudflare, open your site and go to Security.
  2. Find IP Access rules and add a rule for each address above.
  3. Set the action to Allow and apply it to this website.

On Pro or higher (Super Bot Fight Mode), you can add a custom rule instead:

  1. Go to Security, then Security rules, and create a custom rule.
  2. Edit the expression and enter (ip.src in {54.37.135.109 51.77.137.158}).
  3. Set the action to Skip, then choose all Super Bot Fight Mode rules and all remaining custom rules.
  4. Put the rule first and deploy it.

The next check shows if it worked. In Uptendr, open your app and select Check now on the Pages tab.

Other firewalls

On Vercel, Netlify or another host with a firewall, allow the two addresses above. If your firewall works by user agent, allow UptendrBot and UptendrBrowser.