24 = 255.255.255.0 HostMin: 192.168.0.1 HostMax: 192.168.0.254 (254 usable IPs)
23 = 255.255.254.0 HostMin: 192.168.0.1 HostMax: 192.168.1.254 (508 usable IPs)
22 = 255.255.252.0 HostMin: 192.168.0.1 HostMax: 192.168.3.254 (1016 usable IPs)
21 = 255.255.248.0 HostMin: 192.168.0.1 HostMax: 192.168.7.254 (2032 usable IPs)
20 = 255.255.240.0 HostMin: 192.168.0.1 HostMax: 192.168.15.254 (4064 usable IPs)
https://www.calculator.net/ip-subnet-calculator.html