Networking / Beginners

Dotted Names

Hostnames may contain letters, numbers, or a few symbols. The dot character is normally used to separate hostname segments (hostname, domain, subdomain, etc.). For example, the hostname contains the segments www, google, and com. If the hostname cannot be resolved, then the local domain is appended and the lookup is retried.

Anyone wanting to obscure a hostname can specify a name with a dot. For example, the domain test.lan may have the hostname A lookup of the hostname without the domain reveals the information for the host www in the domain. However, a lookup with the domain, lan, resolves to a different system.

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