The host name and fully qualified domain name (FQDN) are limited to [tex]63[/tex]bytes per label and [tex]255[/tex] characters per FQDN, respectively.
A fully qualified domain name (FQDN), sometimes known as an absolute domain name, is a domain name that indicates its precise position inside the Domain Name System's tree structure (DNS). It details every domain level, including the root zone and top-level domain. In the hierarchy of DNS labels, a fully qualified domain name is defined by the fact that there is no room for interpretation in regards to where the DNS zone should be located. Since domain names in DNS are readable from right to left, we must understand where to begin in order to find.
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