Monitoring bot
SentinelBot
A monitoring bot that checks website availability, SSL certificates, and other health metrics.
User-Agent
Request frequency
Once per check interval from each region a monitor uses. The monitor owner sets the interval, from every 15 seconds to every 60 minutes.
Robots.txt
Respects robots.txt
Performs uptime checks only; does not index or crawl content.
Rate limiting
- Per region
- Each monitored URL receives one request per check interval from each active monitoring region.
- Intervals
- Configurable from 15 seconds to 60 minutes per monitor
- Regions
- 15 regions on 6 continents
Monitoring infrastructure
IP addresses by location
To allowlist SentinelBot, add these IP addresses to your firewall or WAF rules.
New addresses are published here before they send their first request.
Paid agent traffic
Probes and callbacks bought by AI agents
Sentinel also sells single-shot probes, watches and callbacks to AI agents, paid per call. That traffic comes from the same IP addresses published here, so an allowlist covers it too.
- Probe user agent
- Mozilla/5.0 (compatible; SentinelBot/1.0; +https://sentinel.rootstuff.io/bot)
- Callback user agent
- Sentinel Wake/1.0 (+https://sentinel.rootstuff.io/mpp/)
- Callbacks come from
- 5.161.92.93 only
- Limits
- Per target host: 60 probes an hour, 10 distinct ports a day. Per callback host: 25 live wakes, and a 24-hour block after three refused callbacks. Private and reserved addresses are refused; redirects are never followed.
- Headers
- X-Sentinel-About, X-Sentinel-Abuse, X-Sentinel-Signature
- Opting out
- Email [email protected] with the host and it is excluded from paid probes, watches and callbacks, subdomains included, usually the same day.
Machine-readable copy of this page: /bot.json
What this bot does not do
SentinelBot only performs simple HTTP requests to check availability. It will never:
- Index or crawl your content
- Fill in or submit your forms
- Execute JavaScript or follow links
- Store or share any content from your site
FAQ
Common questions
Why is this bot accessing my website?
It performs uptime checks on behalf of someone who has configured monitoring for your site. The checks confirm your site stays available and performant.
How can I allowlist this bot?
Add the IP addresses listed above to your firewall or WAF rules, or allowlist requests carrying our User-Agent string.
How do I stop these requests?
If you'd like us to stop monitoring your site, contact us and we'll work with the monitor owner to resolve it.
Want the requests to stop?
Email us at [email protected] and we'll work with the monitor owner to resolve it.
Questions about the bot?
If you need help allowlisting SentinelBot or have any questions, reach out.