Some address ranges from each of the network classes have been set aside and designated "reserved" or "private" address ranges. These addresses are reserved for use by private networks and are not routed on the Internet. They are commonly used by organizations building their own intranet, but even small networks often find them useful. The reserved network addresses appear in Table 2-1 .
Table 2-1. IP Address Ranges Reserved for Private Use
Class
Networks
A
10.0.0.0 through 10.255.255.255
B
172.16.0.0 through 172.31.0.0
C
192.168.0.0 through 192.168.255.0
Notes
The version of the Internet Protocol most frequently used on the Internet is Version 4. A lot of effort has been expended in designing a replacement called IP Version 6. IPv6 uses a different addressing scheme and larger addresses. Linux has an implementation of IPv6, but it isn't ready to document it in this book yet. The Linux kernel support for IPv6 is good, but a large number of network applications need to be modified to support it as well. Stay tuned.
[2]
Frequently, IP addresses will be assigned to you by the provider from whom you buy your IP connectivity. However, you may also apply to the NIC directly for an IP address for your network by sending email to hostmaster@internic.net , or by using the form at http://www.internic.net/ .
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