Wildcard synthesis
09DNS wildcards synthesize records under specific tree-matching rules; they do not replace every matching string.
Terms in this drawing
Related RFCs and changes
“Updates” changes part of an earlier RFC. “Obsoletes” replaces it. This list shows selected related documents.
DIAGRAM§ 4.3.3 ↗
RFC 1034 · § 4.3.3EXAMPLE
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Return the synthesized record.
This is an answer generated by DNS tree rules, not a web-server redirect.
Protocol participantThreat or exceptionProtocol controlSimplified drawings · precise section references
Read the updated RFC section ↗
Tree existence controls wildcard use.
- An exact name match takes precedence over wildcard synthesis.
- Delegation boundaries prevent a parent wildcard from answering inside a child zone.
- Synthesis uses wildcard data but sets the answer owner to the queried name.
RFC 4592 later clarifies wildcard terminology and behavior. This chapter illustrates the original concept; it is not a full implementation algorithm.
Read the RFC section ↗Diagrams simplify the RFC. Read the linked sections for complete requirements.
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