A fully qualified domain name (FQDN) is the complete, unambiguous domain name for a specific computer, or host, on the internet. It specifies the exact location of that host within the entire hierarchy of the Domain Name System (DNS), leaving no doubt about which server it actually points to. Breaking Down an FQDN An FQDN is made up of several parts, read right to left: Top-level domain (TLD) — the rightmost segment, such as .com , .org , or .io . Think of it as the root of a very large filing system that every other domain name lives underneath. Domain name — the specific name registered within that TLD, such as example.com . Hostname (or subdomain) — the leftmost segment identifying a specific host or service within that domain, such as www or mail . Put together, mail.example.com is a complete FQDN: mail is the hostname, example is the domain, and .com is the TLD. A company that registers example.com has full authority to create as many subdomains under it as it nee...
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