This page doesn't assert an answer — it checks, live, in your browser, right now. Every row is a real request from your device to an independent door into the network. If a door is shut, you'll see it go red here while the others keep serving.
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Honest limits: your browser can only report what it can reach from where you are. Green means that door returned our actual app to you — we read the response, we don't just count that something picked up the phone. Amber means something answered on that name but we could not confirm it was us: a captive portal, an interception proxy, or a block page looks exactly like this, so we refuse to call it up. Red means nothing answered — which may be the door being down or your own network blocking it; from here those are indistinguishable and we won't pretend otherwise. Every check gives up after 8 seconds rather than hanging on an unknown.