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No.157 What IP address ranges qualify as private? 16-05-2007
Category : basic

IANA(Internet Assigned Numbers Authority) defines specific address ranges within Class A, Class B, and Class C reserved for use by private networks (intranets). The table below lists these reserved ranges of the IP address space.


A class 10.0.0.0 ~ 10.255.255.255 (1 A class)
B class 172.16.0.0 ~ 172.31.255.255 (16 B classes)
C class 192.168.0.0 ~ 192.168.255.255 (256 C classes)


Devices with private IP addresses cannot connect directly to the Internet. Likewise, computers outside the local network cannot connect directly to a device with a private IP. Instead, access to such devices must be brokered by a router or similar device that supports Network Address Translation (NAT). NAT hides the private IP numbers but can selectively transfer messages to these devices, affording a layer of security to the local network.

when use ezTCP in private network, the IP numbers should falls within one of the IP address ranges which referred from the above table.





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