When a site refuses to load it is hard to tell who is at fault: the service, your router, or the network you are sitting on. This tool knocks on eighteen popular services straight from your browser and shows who answered quickly, who answered slowly and who said nothing at all.
The check takes up to ten seconds. Your browser talks to the services directly, neither the request nor the result reaches our servers.
The browser asks each service for a tiny image, its favicon. If it arrives, the domain opens. An error, or silence for eight seconds, means the domain is unreachable: the network, DNS or the service itself is in the way. A slow answer next to fast neighbors points to throttling rather than a block.
A service can open and still work at half speed: the site loads but video does not; the messenger sends text but calls stay dead. This check only looks at whether the domain answers. The opposite happens too, a domain can be down because of an outage, so repeat the test in a few minutes before drawing conclusions.
First find out whether the network is to blame: switch from Wi-Fi to mobile data and run the test again. If everything opens on the other network, the restriction is on the first one. A VPN helps from there: traffic moves inside an encrypted tunnel and the network only sees a connection to the server. If the VPN will not connect either, look at the UDP block test.
404 VPN carries your traffic through an encrypted tunnel: services open the way they do at home, and the network only sees a connection to the server.
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