Monitoring IP addresses
WatchCat performs uptime checks from the following IP addresses. Use these to allow monitoring traffic through your firewall, CDN, or WAF.
Whitelisting vs custom headers
IP whitelisting works but has a maintenance cost — you need to update your firewall rules whenever monitoring infrastructure changes. For CDNs and WAFs with rule engines, a custom header is usually a better long-term solution.
Option 1 — custom header bypass (recommended)
Add a secret custom header to your WatchCat monitor, then configure your CDN or WAF to bypass bot protection for requests containing that header.
- Open your monitor's settings and add a custom header — for example
X-Monitor-Key: your-secret-value. - In your CDN or WAF, create a bypass rule that allows requests where that header is present. Use a long random string as the value.
This works with Cloudflare (WAF bypass rule), BunnyCDN (Edge Rule), and most other CDNs that support header-based rules.
Option 2 — IP whitelist
Add all IP addresses listed above to your firewall or CDN's allowlist. Remember to update this list if you expand monitoring to new regions.