---
title: DNS Theory
breadcrumbs:
- title: IT
- title: Services
---
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## Special TLDs

- `.localhost`: For statically defined domain names pointing to localhost. (RFC 2606)
- `.example`: For documentation or examples. (RFC 2606)
- `.test`: For testing. (RFC 2606)
- `.invalid`: For domain names that should never be valid. (RFC 2626)

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