Which is the private IP address that cant be routed across the internet?

The ranges and the amount of usable IP's are as follows:

10.0.0.0 - 10.255.255.255

Addresses: 16,777,216

172.16.0.0 - 172.31.255.255

Addresses: 1,048,576

192.168.0.0 - 192.168.255.255

Addresses: 65,536