Hello @Terry,
Here is another suggestion, why not setup a Captive Portal using Social Media. We have been having really good success using this as a means of both managing internet access and the data used.
@Keith has put together an extensive guide in setting this up at
We have been using the captive portal with all the different access options (including SMS verification) for a variety of clients. Since we’ve started using the Captive Portal via InControl2, we have seen leading industry results over any other vendors systems we’ve worked previously with, I still standby what I wrote here earlier this year
@Joey_van_der_Gaag has you also on the right track if you wish to perusing the MAC address side, though this option will required a large amount of ongoing administrative work as people come and go and they get new devices.
Upgrade the router to the latest firmware (if not already done) and give the content filtering a go first, do not over complicate what you can most likely solve easily.
Happy to Help,
Marcus 