The IANA has reserved a block of IPv4 addresses and an IPv6 site prefix for use on private networks. You can deploy these addresses on systems within an enterprise network but be aware that packets with private addresses cannot be routed across the Internet. For more information on private addresses, refer to Using Private IPv4 Addresses.
Private IPv4 addresses are also reserved for documentation purposes. The examples in this book use private IPv4 addresses and the reserved IPv6 documentation prefix.