massagevendor - Man Page

convert the ethernet vendor codes master list to arpwatch format


massagevendor[-CdhvZ] [--vendor] [csv]


massagevendor is a program that converts a text file containing ethernet vendor codes into a format suitable for use by arpwatch(8) and arpsnmp(8). The input csv is a master CSV (comma-separated-value) file containing vendor codes. The output is sent to stdout.

All ethernet devices have a unique identifier which includes a vendor code specifying the manufacturer of the device. In normal operation arpwatch(8) and arpsnmp(8) use the file ethercodes.dat to report this vendor code. massagevendor is used to generate the ethercodes.dat file from CSV files containing these vendor codes.

Locations where an ethernet vendor codes master text file can be obtained are given below.

The -C flag (default) uses compact padded ethernet addresses in ethercodes.dat, e.g. 0:8:e1:1:2:d6; this is the default.

The -d flag is used to enable debugging.

The -v flag is used to enable verbose messages.

The -Z flag uses zero padded ethernet addresses in ethercodes.dat, e.g. 00:08:e1:01:02:d6.

The -h flag shows a help message and exits.

The --version option shows the program version number and exits.



default location of the ethernet vendor list


file containing the list of ethernet vendor codes

See Also

arpwatch(8), arpsnmp(8)


The ethernet vendor codes as assigned by the IEEE can be found at:


Craig Leres of the Lawrence Berkeley National Laboratory Network Research Group, University of California, Berkeley, CA.

The current version is available via anonymous ftp:

This manual page was contributed by Hugo Graumann and updated by Benjamin Beasley.


Please send bug reports to ⟨⟩.


8 November 2020