Date: 2019mar4 Update: 2026jul29 Q. Web: Private IPv4 address ranges A.

Private IPv4 addresses RFC1918 name IP address range mask bits 24-bit block 10.0.0.0 – 10.255.255.255 8 bits 20-bit block 172.16.0.0 – 172.31.255.255 12 bits 16-bit block 192.168.0.0 – 192.168.255.255 16 bits

More info https://tools.ietf.org/html/rfc1918 There are also private domain names: localhost and localdomain You can use any name and any of the above reserved addresses under localdomain - eg kitchen.localdomain = 192.168.25.10 garage.localdomain = 192.168.25.11