IPv4 Private Address Space and Filtering
10.0.0.0/8 IP addresses: 10.0.0.0 — 10.255.255.255.
172.16.0.0/12 IP addresses: 172.16.0.0 — 172.31.255.255.
192.168.0.0/16 IP addresses: 192.168.0.0 – 192.168.255.255.
You can use any and all of these with the /24 netmask
for instance 10.1.2.0/24