Captive Portal Check ![State](https://status.sp-codes.de/api/badge/19/status?label=State&upLabel=Online&downLabel=Outage&maintenanceLabel=Maintenance)
A captive portal is a login page in public WLAN networks to restrict Internet access to the approval of certain terms of use. When you see a login page on a public network, your device uses a captive portal check. This allows the device to find out whether you have direct Internet access or not. In Android, for example, your device sends a request to a Google server.
More useful links
My Offer
Since mid 2019 I provide a free Captive Portal Check: https://connectivitycheck.sp-codes.de/generate204
Setup
Here you will find an article that explains how to set it up on various devices: