Let's plug one of my "joke" domains: http://amibehindacaptiveportal.com http://amibehindacaptiveportal.com If you get any response other than "No" then you're

Let's plug one of my "joke" domains: http://amibehindacaptiveportal.com http://amibehindacaptiveportal.com If you get any response other than "No" then you're behind a captive portal.