How many devices connection to my wi-fi router and how block illegal connection ? (Block IP Address)

How many connections to my wi-fi router and block illegal connection ?
1). Connect from browser to IP Address - 192.168.1.1 or 192.168.0.1 or 192.168.100.1
2). Look how many connections to my wi-fi
3). Block illegal connection and check
4). Subscribe to the channel

[@alberthernandez8588]

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