The IANA also designated a range of addresses in class A, B and C for use in private networks. These addresses can be used by anyone within their network without any required permission but these addresses are not routable on the Internet. You ISP or your organization usually assigns you one of these addresses and later translates it to a public address when you want to get out to the Internet. The designated ranges for private IP addresses are:
Class A – 10.0.0.0 to 10.255.255.255 (1 network)
Class B – 172.16.0.0 to 172.31.255.255 (16 networks)
Class C – 192.168.0.0 to 192.168.255.255 (256 networks)
Exam Alert: It is very important to remember the range of private IP addresses as you will more than likely see a question about them on your CCNA exam.
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