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IP addresses

Pulsefast checks come from a few fixed addresses: one set per region. If your site sits behind a firewall, an allowlist, or bot protection (Cloudflare's bot fight mode, a WAF, rate limiting), let these addresses through, or checks may be blocked and show your site as down when it isn't.

• List, one address per line: /ips
• JSON, by region, for scripts: /ips.json

The list changes rarely, and never without notice to customers by email.

Checks also identify themselves with the user agent Pulsefast/0.1 (+https://pulsefast.io), which some tools can allow instead of addresses.

Cloudflare: add the addresses to an IP Access rule with the action Allow, or a custom rule that skips bot protection for them.

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