Why does one failing region show “not confirmed”?

Network blips in a single region are common. A site is only reported down when several independent regions fail at the same time.

Will the check put load on my site?

Each region sends a single ordinary GET request — about the same as one visitor opening the page.

No. For security, localhost, private networks and cloud metadata addresses are blocked.

https://toolhub.sbs/

Requesting from 10 regions at once — usually a few seconds

Why does one failing region show “not confirmed”?: Network blips in a single region are common. A site is only reported down when several independent regions fail at the same time.
Will the check put load on my site?: Each region sends a single ordinary GET request — about the same as one visitor opening the page.
Can I check internal addresses?: No. For security, localhost, private networks and cloud metadata addresses are blocked.

Monitor 3 sites for free, checked every 5 minutes. Alerts are only sent after several regions confirm the outage.