IP address range for examples in documentations
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: 1.2.3.4 and xxx.xxx.xxx.xxx