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libpcap file format (.pcap)

The libpcap file format is used by a wide range of open (and closed) source programs.


The current libpcap file format version 2.4 is available for quite a long time now.

Programs supporting this file type

Timestamp resolution

The common timestamp resolution is 1 us. A special libpcap format is available by Ethereal only, providing 1 ns timestamp resolution.


The libpcap support is fully functional. Ethereal supports reading and writing of this format.

Example capture file

XXX - Add a simple example capture file to the SampleCaptures page and link from here (see below). Keep this file short, it's also a good idea to gzip it to make it even smaller, as Ethereal can open gzipped files automatically.