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PCAP Capture File Format

Document Type Expired Internet-Draft (individual)
Authors Guy Harris , Michael Richardson
Last updated 2021-12-25 (Latest revision 2021-06-23)
Stream (None)
Intended RFC status (None)
Expired & archived
Stream Stream state (No stream defined)
Consensus boilerplate Unknown
RFC Editor Note (None)
IESG IESG state Expired
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at:


This document describes the format used by the libpcap library to record captured packets to a file. Programs using the libpcap library to read and write those files, and thus reading and writing files in that format, include tcpdump.


Guy Harris
Michael Richardson

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)