Reminder that the only safe dummy domains to use are:
- example.com
- example.net
- example.org
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 on direction of IETF in RFC 2606 and RFC 6761.
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.
@jnfingerle I did a correction to my main post now, the example.edu should not have been there, Wikipedia tricked me to thinking it was part of the IETF RFC.
My focus was on the second level domains of ordinary TLD:s, not on special TLD:s.
Also:
- All .invalid domains are explicitly by definition invalid
- .test domains are intended to test DNS related code
So for any ordinary use those two wouldn’t qualify anyhow.
See: https://datatracker.ietf.org/doc/html/rfc2606#section-2
To reduce the likelihood of conflict and confusion, a few top level domain names are reserved for use in private testing, as examples in documentation, and the like. In addition, a few second level domain names reserved for use as examples are documented. This document specifies an Internet Best Current Practices for the Internet Community, and requests discussion and suggestions for improvements.
Pelle Wessman
Jan Niklas Fingerle