A captive portal is a web browser-accessible website that displays new users connected to a Wi-Fi or wired network before gaining wider access to network resources. Captive portals are often used to present a home or registration page that requires authentication, payment, acceptance of an end-user license agreement, an acceptable usage policy, survey conclusion, or other valid credentials that the host and user accept. Captive portals are used for a wide range of mobile and pedestrian broadband services, including cable and commercial wi-fi and hotspots for private companies. A captive portal can also be used to allow access to networks of businesses or cable dwellings such as apartment buildings, hotel rooms and business centres. Captive portals are often used for marketing and commercial communication purposes. Access to the Internet via open Wi-Fi is prohibited until personal data is exchanged by filling out a web registration form in a web browser. The web form automatically opens in a web browser or appears when the user opens a web browser and tries to visit a website. In other words, the user is “trapped” – not being able to freely access the Internet until the user has access to the Internet and has “completed” the captive portal. In this way, the provider of this service can send ads or ads to users who connect to the Wi-Fi hotspot. This type of service is also sometimes called “social Wi-Fi” because they can request a social network account to register (like Facebook). In recent years, such wi-fi-captive portals have become commonplace, as many companies offer marketing services that revolve around the collection of wi-fi data.
Another good option is to open the website that tries to open your device to visit manually in the background when you connect to new Wi-Fi networks. When you`ve been charging your device, you may have noticed captive.apple.com by making a Wi-Fi connection. You can go directly to this site to force your browser to test the connection. Here are the standard pages, each of which works on each platform: some of these implementations simply require users to pass a TLS or SSL encrypted login page, according to which their IP and MAC addresses can pass through the gateway. This proved useful with a simple packet snoop. Once the IP and MAC addresses of other login computers have been authenticated, each computer can find the authenticated target`s MAC address and IP address (Internet Protocol) and get a route via the gateway.