Since I was not satisfied with the mac-manufacturer list that was distributed with the Kismet package, I decided to make my own list, based on a manufacturer list I found on this official ieee page: http://standards.ieee.org/regauth/oui/oui.txt

This code wget-downloads the file and converts it to the Kismet manufacturer list format:

cd /tmp
wget http://standards.ieee.org/regauth/oui/oui.txt
cat oui.txt | grep "(hex)" | sed -r 's/(..)-(..)-(..)   \(hex\)\t\t(.*)/\1:\2:\3:00:00:00\/FF:FF:FF:00:00:00\t\4\tUnknown\t0/' > macs.txt

Simply copy the file "macs.txt" into the "/etc/kismet" directory (you need to be root) and edit the Kismet configuration file:

Change the lines

ap_manuf=ap_manuf
client_manuf=client_manuf

to

ap_manuf=macs.txt
client_manuf=macs.txt

And then you're done!