UptimeRobot User Agent & IP Addresses Explained

01 · Operator

Who operates UptimeRobot

Company: UptimeRobot
Type: Monitoring bot
Official docs: uptimerobot.com

02 · Behavior

What UptimeRobot does

UptimeRobot sends HTTP requests to monitored URLs from several locations. It alerts users when a site is down or slow. It publishes its monitoring IP addresses so site owners can whitelist them.

03 · Impact

Why UptimeRobot matters for your site

If you allow it

Checks are usually set up by the site owner
Downtime alerts need the checks to succeed
IPs are published for verification

If you block it

Third parties can monitor your site without asking
Frequent checks add small, constant load

04 · Allow

How to allow UptimeRobot

robots.txt

User-agent: UptimeRobot
Allow: /

Cloudflare

# Security › WAF › Custom rules › Create rule
Expression: (http.user_agent contains "UptimeRobot")
Action:     Skip › All Super Bot Fight Mode rules

# Also check Security › Bots: "Block AI bots" can block it regardless of robots.txt.

WordPress

# WordPress serves a virtual robots.txt. Edit it with your SEO plugin:
# Yoast: SEO › Tools › File editor · Rank Math: General Settings › Edit robots.txt
User-agent: UptimeRobot
Allow: /

nginx

# nginx serves every user agent by default.
# Make sure no rule like this blocks it:
# if ($http_user_agent ~* "UptimeRobot") { return 403; }

Apache

# Apache serves every user agent by default.
# Make sure .htaccess has no rule like this:
# RewriteCond %{HTTP_USER_AGENT} UptimeRobot [NC]
# RewriteRule .* - [F,L]

05 · Block

How to block UptimeRobot

Start with robots.txt. If UptimeRobot keeps showing up in your logs, block it at your CDN or web server.

robots.txt

User-agent: UptimeRobot
Disallow: /

Cloudflare

# Security › WAF › Custom rules › Create rule
Expression: (http.user_agent contains "UptimeRobot")
Action:     Block

WordPress

# WordPress serves a virtual robots.txt. Edit it with your SEO plugin:
# Yoast: SEO › Tools › File editor · Rank Math: General Settings › Edit robots.txt
User-agent: UptimeRobot
Disallow: /

nginx

# In your server { } block:
if ($http_user_agent ~* "UptimeRobot") {
    return 403;
}

Apache

# .htaccess
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteCond %{HTTP_USER_AGENT} UptimeRobot [NC]
RewriteRule .* - [F,L]
</IfModule>

06 · User agents

User agents we see for UptimeRobot

The user agent published by the operator:

Mozilla/5.0+(compatible; UptimeRobot/2.0; http://www.uptimerobot.com/)

07 · Verification

Is it really UptimeRobot?

Anyone can copy a user agent. Real UptimeRobot requests come from the IP ranges published at cdn.uptimerobot.com/api/IPv4andIPv6.txt.

FAQ

Questions about UptimeRobot

What is the UptimeRobot user agent?

UptimeRobot's FAQ gives it as Mozilla/5.0+(compatible; UptimeRobot/2.0; http://www.uptimerobot.com/).

Where can I find UptimeRobot IP addresses?

UptimeRobot publishes lists at cdn.uptimerobot.com/api/IPv4.txt and IPv4andIPv6.txt, plus a JSON list at api.uptimerobot.com/meta/ips.

Why is UptimeRobot hitting my site?

Someone has set up a monitor for your URL in UptimeRobot. If it is not you, you can block its published IPs or user agent.

UptimeRobot is UptimeRobot’s monitoring bot