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Checker IP addresses
All checks come from these addresses with User-Agent: Tenium-Monitor/1.0. Updated 2026-11-10. Machine-readable: /checker-ips.json.
Checks run from two regions. Addresses for any region we add later are published here, with notice, before it starts sending checks.
| Region | Location | IPv4 | IPv6 |
|---|---|---|---|
ams | Amsterdam, NL | 164.92.217.216 | |
lon | London, GB | 209.97.131.38 |
Change policy
New addresses are announced at least 14 days ahead in the changelog and by email. Removed addresses stay listed for 14 days after they stop checking. For WAF allow-listing we recommend the User-Agent plus secret header method described in the Cloudflare docs, with IPs as an optional second factor.
Fetch in a script
curl -s https://tenium.app/checker-ips.json | jq -r '.regions[].ipv4[]'