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Kudos to the author for using RFC5737[0] TEST-NET-2 address for:

> An example of an IPv4 IP address is 198.51.100.1.

[0] https://www.rfc-editor.org/rfc/rfc5737

I'm a big fan of using identifiers reserved for examples. I use TEST-NET-2 IP's and example.com all the time in my documentation!

Where it gets interesting is when documentation uses a typoed reserved address (e.g. 189.51.100.1 or 198.15.100.1). There are actually several RFCs that do this.

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