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https://mandarapte.com/apple/current-time-capsule-airport-extreme-airport-express-wi-fi-network-hidden-wi-fi-enabled-devices-including-macintosh-iphone-ipad-ipod-touch/
How to make current Time Capsule, Airport Extreme or Airport Express Wi-Fi network hidden for all new wi-fi enabled devices including Macintosh, iPhone, iPad & iPod touch