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They use more than that, I've seen it on the wire (to prevent DNS caching I believe).

http://neverssl.com also works

And https://1.1.1.1 breaks people's brains if they know enough

Even more fun: https://16843009

Did they actually issue the certificate for that??

No, your browser converts it before access

And there's https://1.1

I prefer https://1.1.257

I like

http://uz

Whenever I access a public Wi-Fi with login / captive portal, and the portal doesn’t show up immediately, I enter captive.apple.com in Safari to trigger it! Works every time (iPhone)

I use example.com :) Less typing.

For french speaking gals/guys, there's http://perdu.com too (lost.com basically)

http://example.com is also good.