Reserved Domains
RFC 2606 reserves the following four top-level domain names to avoid confusion and conflict. They may be used for various specific purposes however, with the intention that these should not occur in production networks within the global domain name system:
- example: reserved for use in examples
- invalid: reserved for use in obviously invalid domain names
- localhost: reserved to avoid conflict with the traditional use of localhost as a hostname
- test: reserved for use in tests
Read more about this topic: Top-level Domain
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