Website reliability reports
What our own monitoring of 836 popular websites shows each month. Single-location checks every 30 minutes, published with the method and its limits.
How we measure
We request each site's home page from our servers about every 30 minutes. Failures (connection errors, timeouts, 5xx responses) are re-checked a few seconds later before they count as an outage. Responses such as 403 or 429 count as reachable, because many large sites refuse automated requests. All measurements come from one location, so a regional routing problem on our side can look like an outage. Treat these as indicative, not official.