Is there an IP address range dedicated to example in documentations ? (Like example.com for DNS)
You mean like RFC 5737?
The blocks are: 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)
No, just use any of the RFC 1918 Addresses and you'll be fine. The other optino i've seen in documentation is the form:
I am not aware of an IP address equivalent to "foo" and "bar", but I could recommend using the 10-net range since it is not routable and reserved for internal networks. Since you can use the entire 10.x.x.x set, it would prove perfect for just about all scenarios.