Compress a repeated name suffix
03A pointer can replace a previously occurring name or suffix within the same DNS message.
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“Updates” changes part of an earlier RFC. “Obsoletes” replaces it. This list shows selected related documents.
DIAGRAM§ 4.1.4 ↗
RFC 1035 · § 4.1.4EXAMPLE
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03
A pointer refers back to the existing example.org suffix.
A pointer refers back to the existing example.org suffix.
Protocol participantThreat or exceptionProtocol controlSimplified drawings · precise section references
Read the updated RFC section ↗
A compression pointer uses the top two bits 11 and a 14-bit message offset.
- A compression pointer uses the top two bits 11 and a 14-bit message offset.
- Parsing must remain bounded; a malformed pointer must not cause unbounded traversal.
The drawing is a simplified worked example. Follow the linked RFC and its updates for implementation requirements.
Read the RFC section ↗Diagrams simplify the RFC. Read the linked sections for complete requirements.
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