Yes, the advice is dated.
RFC 1597 reserves IP addresses for private networks.
These addresses are guaranteed not to be routed over the Internet
backbone and (should) not be routed by your Internet provider.
The addresses are:
10.0.0.0 - 10.255.255.255
172.16.0.0 - 172.31.255.255
192.168.0.0 - 192.168.255.255
These are the traditional class A, B, and C addresses, respectively.
The advantage is you don't consume valuable IP address space.
If you plan to connect eventually, you need to get IP addresses
assigned by your IP provider now, not the old-fashioned "portable"
IP addresses that will be routed by any internet provider.
>I just read a recommendation to obtain IP addresses from internic even
>if I don't currently intend to connect to the Internet. The book appears
>to be a little dated since it states domain names are free. Is this
>recommendation dated also?