Demultiplex using ports
02A destination port selects a receiving application in the context of the destination IP address.
Related RFCs and changes
“Updates” changes part of an earlier RFC. “Obsoletes” replaces it. This list shows selected related documents.
DIAGRAMFields ↗
RFC 768 · FieldsEXAMPLE
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03
Deliver it to the corresponding receive port, not every application.
Deliver it to the corresponding receive port, not every application.
Protocol participantThreat or exceptionProtocol controlSimplified drawings · precise section references
Read the updated RFC section ↗
UDP source and destination port fields are each 16 bits.
- UDP source and destination port fields are each 16 bits.
- The original source-port field may be zero when unused; a meaningful source port can guide replies.
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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