Sources and how this site works

How to read what you see

• Stale after 10 minutes for most sources. The limit depends on how often a source is checked: twice its check interval, and at least 10 minutes (hourly sources 120 minutes, six-hourly sources 720 minutes). If the last good check of a source is older than its limit, the item shows Stale beside its last known state.
• Unknown after 30 minutes for most sources. The limit depends on how often a source is checked: three times its check interval, and at least 30 minutes (hourly sources 180 minutes, six-hourly sources 1080 minutes). If the last good check is older than its limit, the item shows Unknown, which means we cannot tell. Unknown is never counted as healthy.
• Warning banner after 10 minutes. If the whole set of readings is older than 10 minutes, every page shows a banner saying the data may be out of date. A page that cannot load data says so plainly and never shows an empty all-clear.
• Our own checks. A reachability check requests a provider's public page. It is measured from Cloudflare's network, and the location is not fixed, so a check can fail for a reason that does not affect you.
• No public feed. Some providers publish no status feed. They are shown as No public feed, with a reachability check and a link to the official page.

Where the data comes from

Technology

Internet

Cybersecurity

Aviation

Weather and hazards

Traffic anomaly data: Cloudflare Radar, licensed under Creative Commons Attribution-NonCommercial 4.0 International.

Collector health