Table 1. IP Addresses Reserved for Private Network Allocations (RFC1597)
Network Class
Netmask
Network Addresses
# of Networks in class
# of hosts supported
A
255.0.0.0
10.0.0.0-10.255.255.255
254
16,000,000
B
255.255.0.0
172.16.0.0-172.31.255.255
64,000
64,000
C
255.255.255.0
192.168.0.0-192.168.255.255
16,000,000
254