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RFC 1918

As explained in Acing the CCNA Exam: Volume 2 Advanced Networking and Security

RFC 1918 is the Request for Comments document that defines IPv4 address ranges reserved for private internetworks.

RFC 1918 defines IPv4 address ranges for private internetworks. Organizations can use these addresses internally without global uniqueness, but the addresses are not routable across the Internet. section 9.4

The three RFC 1918 private IPv4 ranges are:

Internet service providers discard packets sourced from or destined for private addresses. NAT translates private addresses to public addresses when internal hosts need Internet communication. section 9.4

How Acing the CCNA Exam: Volume 2 Advanced Networking and Security covers it

How deep it goes
Specifies three private ranges and their Internet-routing limitation, while leaving translation behavior to NAT.
Examples
Lists 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16 as private ranges.
What it assumes
Assumes IPv4 addressing and distinguishes private addresses from globally unique public addresses.
What you can do after
Evaluate IPv4 addresses as private or public and determine when NAT is required for Internet communication.
How it connects
Connects private IPv4 addressing with IPv4 exhaustion, NAT, public IPv4 addresses, and IPv6.
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