The way of blacklist wifi user
Plural devices can connect to wifi network without any password. Multiple users can make the quality of the internet weaker. If consumption of data increases everyone who is using that wifi will be using poor and slow internet including the host. Still host can control the internet connection and the users of wifi. If you want to block unauthorized accesses you can try these things.
For TP-link open your network page and enter 192.168.1.1 or 192.168.10.1 the panel. Login to your admin panel. Then go to Advance – Security and Access Control. Now you can see who is accesing your wifi. After that you can click on the block and save it.
For D-Link users open your admin panel on your browser. And go to Wireless and Advanced wireless click on ACL setup. After that you will see “Enable Wireless Access Control Mode” and select the person you want to block.
And for the NetGear users open your admin panel on any browser on your computer. Enter your default password and your username. Go to wireless settings and click on the set up Access list. Now you can control everyone on your wifi.