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example.com (and other example.*) is reserved for documentation purposes, i.e. you can't buy it.

Like blocks 192.0.2.0/24 (TEST-NET-1), 198.51.100.0/24 (TEST-NET-2) and 203.0.113.0/24 (TEST-NET-3) from rfc5737? Or is it to new, maybe 192.0.2.0/24 from rfc2119 is better? There is a few test-nets for documentation, just like example.com.

Just like 1.1.1.1 used to be null routed?

Not exactly; example.com and .org are reserved in RFC 2606[1]. 1.1.1.1 is not listed in the special use RFC[2], it's just an address previously unused by APNIC.

[1]: https://tools.ietf.org/html/rfc2606

[2]: https://tools.ietf.org/html/rfc5735

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