Subdomains
As explained in the DNS protocol, we use the term 'subdomain' to refer to the third-level domains and onward.
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www.example.com
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ftp.internal.example.com
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test.webapp.dev.example.com
- ...
Unlike vhosts, they are stored on a DNS server, which are often public, or accessible from the internal network to everyone.
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Stuff that I found, but never read/used yet.