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Space-bar heater :)

ON a more serious note, I always use http://example.com. Being reserved and maintained by the IANA for documentation and testing, it's the most stable site I can think of.

Be aware that plenty of ISPs sadly MITM example.com. I ran into this when our test suite that curl'ed example.com and checked its output failed when we ran our binary on a new provider.

http://http.rip/

http://something.com

or use what Google does when Chrome notifies you of a login gateway to public wifi: http://www.gstatic.com/generate_204

wow. For those too lazy to do the extra search step: http://www.something.com/faq/

There really should be a new, better solution to captive portals.

There is! RFC 7710[1] specifies a DHCP option/RA extension that encodes the URL of the captive portal, s.t. when, e.g. DHCP completes, the connecting machine immediately knows what the captive portal URL is, and doesn't have to get MitM'd to know it.

[1]: https://tools.ietf.org/html/rfc7710

You learn new things every day. I'd love to see this in greater adoption.

Perhaps zombocom? http://www.zombo.com/