example.com
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| example.com | |
|---|---|
 IANA · Public domain · source | |
| Name | example.com |
| Type | "Informational placeholder" |
| Language | English |
| Owner | "Reserved domain" |
| Launched | 1999 |
| Current status | Active |
example.com is a domain name reserved by standards organizations to serve as a stable, non-resolvable illustrative address in documentation, tutorials, and publications. It functions as a canonical placeholder used by standards bodies, publishers, and educators to avoid accidental reference to active resources. The designation has been adopted widely across technical specifications, textbooks, instructional materials, and software examples.
History
The reservation of canonical example names traces to early efforts by the Internet Engineering Task Force and the Internet Assigned Numbers Authority to reduce accidental collisions in operational namespaces. The specific set of domains including example.com was formalized in publications from the Internet Engineering Task Force working groups and the Internet Architecture Board, influenced by precedents in Request for Comments series and by registry practices at entities like the Internet Corporation for Assigned Names and Numbers. As the World Wide Web expanded through the late 1990s and early 2000s, academic texts from institutions such as Massachusetts Institute of Technology and Stanford University adopted the domains for teaching. Standards documents produced by the IETF and commentary from the Internet Assigned Numbers Authority reinforced their role, leading to widespread adoption across textbooks by publishers like O'Reilly Media and Addison-Wesley.
Purpose and Usage
example.com is used in examples where authors need to show how a fully qualified domain name, URL, email address, or network configuration appears without directing readers to an operational host. Authors in guides produced by O'Reilly Media, educators at universities like Carnegie Mellon University, and technical writers at organizations such as Microsoft and Google use this domain to illustrate syntax in Hypertext Transfer Protocol examples, Domain Name System records, and Simple Mail Transfer Protocol configurations. Standards bodies including the Internet Engineering Task Force and the World Wide Web Consortium recommend these reserved domains in their documentation to prevent inadvertent traffic to live services and to simplify automated testing in environments managed by teams at companies like Red Hat and Amazon Web Services.
Technical Details
Technically, example.com is assigned within the global Domain Name System as a registered domain reserved for documentation; its DNS records are configured to avoid conflict with operational namespaces. The management practices for reserved names were discussed in Request for Comments documents published by the Internet Engineering Task Force, which reference coordination with the Internet Corporation for Assigned Names and Numbers and the Internet Assigned Numbers Authority. In software, libraries such as those maintained by Mozilla and Apache Software Foundation frequently include example.com in test suites for components implementing Hypertext Transfer Protocol, Transport Layer Security, and Simple Mail Transfer Protocol stacks. Tooling from projects like OpenSSL and Let's Encrypt may reference placeholder names in demonstration scripts and tutorial repositories hosted on platforms such as GitHub and GitLab.
Domain Ownership and Administration
The domain is administratively reserved; its stewardship has involved coordination between registry operators and standards organizations such as the Internet Corporation for Assigned Names and Numbers and the Internet Assigned Numbers Authority. Policies about reserved domains were influenced by discussions in the Internet Architecture Board and were implemented in registry practice by organizations that operate top-level domains, including national registries and commercial registries that collaborate under frameworks endorsed by the IANA. Commercial entities and private parties are prevented from repurposing the name for general use to maintain its value as a neutral documentation resource used by vendors like Cisco Systems and Juniper Networks and by academic institutions worldwide.
Security and Privacy
Using reserved domains like example.com for documentation minimizes privacy and security risks that would arise if authors used live domains; this practice reduces accidental leakage of data to third parties and prevents misconfiguration from directing test traffic to production services managed by companies such as Amazon.com, Facebook, and Apple Inc.. Security guidance from organizations like the National Institute of Standards and Technology and recommendations in Request for Comments documents advocate placeholder domains in examples to avoid information disclosure. In automated testing, sandboxing techniques employed by projects like Docker and Kubernetes often incorporate reserved names to isolate network interactions from operational environments, and certificate authorities including Let's Encrypt provide guidance to avoid issuing real certificates for documentation-only names.
Cultural Impact and Examples of Use
Beyond technical standards, example.com appears ubiquitously in educational materials, tutorials, online courses offered by platforms like Coursera and edX, and in vendor documentation from firms such as Microsoft and Oracle Corporation. It features in sample configurations in textbooks published by Prentice Hall and in talks at conferences like DEF CON, Black Hat, and RSA Conference where speakers illustrate concepts without implicating real services. Open-source projects on GitHub and package repositories manage examples that use the domain, and major operating system distributions such as Debian and Ubuntu include documentation that references the name. The domain has thus become a shared cultural artifact within the technical community—an agreed-upon neutral reference that appears in curricula at universities like University of California, Berkeley and in standards-setting activities at bodies like the IETF.