Unrouteable private ip address

There are three address ranges designated as private as per RFC-1918:

• 10.0.0.0 … 10.255.255.255 (10/8) - (Class A network that start with 10.)
• 172.16.0.0 … 172.31.255.255 (172.16/12) - (Class B networks that start with 172.16.)
• 192.168.0.0 … 192.168.255.255 (192.168/16) - (Class C networks that start with 192.168.)

External links

• w:Private network
• Subnetting chart