Definition of FQDN (Fully Qualified Domain Name) - Lifewire
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WebTim Fisher. Updated on July 26, 2023. An FQDN, or a Fully Qualified Domain Name, is written with the hostname and the domain name, including the top-level domain, in that order: [hostname]. [domain]. [tld] . In this scenario, "qualified" means "specified" since the full location of the domain is specified in the name.
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