This check runs on a real home internet connection in the United States — a small hardware probe plugged into an ordinary household router, not a cloud server. It sees the web the way a person in the United States does: the local ISP's routing and DNS, national peering, and any geo-blocks or filtering that apply there.
The check fires from the United States alongside nodes in 11 other countries, so a single run shows you the difference between "the United States has a problem" and "the site is down everywhere". How it works →