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DNS_STATUS_FQDN
An informational name classification
DNS_STATUS_FQDN is a status describing the form of a DNS name, not evidence that the name exists or that a query succeeded. A fully qualified name identifies its position in the DNS hierarchy without depending on a local search suffix. In textual DNS syntax, an explicit trailing root dot is the clearest representation of an absolute name, although application APIs can store or display the normalized form without that dot.
Do not turn this status into a connectivity check. Validation can classify syntax before any packet is sent, and a well-formed FQDN can still return NXDOMAIN, no matching RR type, refusal, timeout, or DNSSEC failure.
How to use the status
- Preserve the original name and the
DNS_NAME_FORMATused for classification. - Avoid appending connection-specific suffixes when the application deliberately supplied an absolute DNS identity.
- Perform a separate query for the required RR type and report its result independently.
- For certificate or policy matching, apply the relevant canonicalization rules rather than assuming syntactic FQDN classification proves identity.
References
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