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Pelle Wessman

Reminder that the only safe dummy domains to use are:

- example.com
- example.net
- example.org
- example.edu

And nowadays there's also a safe dummy TLD: .example

These are safe because they are reserved by IANA as as special-use domain names for documentation purposes.

Any other domain can be registered and as such should _never_ be used as a dummy domain for documentation or as eg. an example in default configs.

See: en.wikipedia.org/wiki/Example.

14 comments
Datenegassie ❌

@voxpelli Dang I was hoping there would be an example.example

Pelle Wessman

@Datenegassie Since the entire .example TLD is safe to use, you can for sure use example.example in your docs 😅 en.wikipedia.org/wiki/.example

artemist

@voxpelli You could also use the example IP addresses, 2001:db8::/32 or any of the 3 blocks for IPv4

Catherine Flick

@voxpelli also great domains to use for dummy email addresses for potentially spammy things! You can check whether they have robust data validity testing going on at the same time.

Tim Mackey 🦥

@voxpelli @NoraReed Wait, does this mean example.zip isn’t a safe dummy domain? 🧐😂

Pelle Wessman

@Timdmackey @NoraReed Yeah, I would not use that, it would only be safe if the owner of the zip TLD has said so, but much safer to go by what IANA has said themselves

Tim Mackey 🦥

@voxpelli @NoraReed lol definitely not! I just think the fact that an “example.zip” domain is even possible is hilarious and absurd 😂

Pelle Wessman

@Timdmackey @NoraReed Well, it could be worse, like if a very common TLD was the same as the file extension of an executable.

Oh, wait 😅 en.wikipedia.org/wiki/COM_file

Kyle Davis

@voxpelli @Timdmackey @NoraReed didn’t the com file go out of regular use before the widespread adoption of the TLD? I seem to recall rarely seeing it by the windows 3.1 era: exe was the executable extension most commonly.

Also, we were so naive back then!

Pelle Wessman

@linux_mclinuxface @Timdmackey @NoraReed Here’s another one: en.wikipedia.org/wiki/.app_(gT

What file extension does a normal MacOS application have? Yeah .app

milosz

@voxpelli It is also worth to mention that IPv4 documentation network blocks are 192.0.2.0/24, 198.51.100.0/24, and 203.0.113.0/24. IPv6 documentation network block is 2001:DB8::/32. See RFC 5737 and RFC 3849

Nicd :unverified:

@voxpelli There's also .invalid and .test TLDs, the former for an invalid domain and the latter for testing.

TRAFFOPOST

@voxpelli Let’s take example.com for example… 😁

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