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
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