FQDN
A fully qualified domain name (FQDN) specifies a host's exact, complete position in the DNS hierarchy -- for example www.example.com -- rather than a partial or relative name a local resolver would need to guess a suffix for. DNS names are defined by RFC 1035, which specifies how a name is built from labels separated by dots, read right to left from the root down to the specific host; an FQDN includes every label needed to resolve unambiguously from the root, conventionally written with a trailing dot to make that explicit, though most software omits it. Entering anything less than a full FQDN into a DNS tool -- just "example" instead of "example.com" -- either fails outright or resolves against a local search-domain suffix that has nothing to do with the intended target. AdminKit's DNS lookup tool validates the FQDN you enter before forwarding the query to its upstream resolver.
By AdminKit team, Netbase JSC · Updated