URLs and Domain Names
When including a domain name for an example web site or email address, use the special-use domain name given in section 6.5 of RFC 6761.
The Internet Assigned Numbers Authority (IANA) have reserved the following domains for demonstration and documentation:
*.example *.example.com *.example.net *.example.org
Example
The following URLs and email addresses would be acceptable in documentation:
nimesh@example.org
liadan@example.net
Warning
Never use a customer's or sample customer's URL or email address. Don't invent a fake domain name for this purpose. Even if that name isn't registered today, someone might claim it in the future.