A quite good summary about OUI databases can be read here. To simplify things and save space and computing power on the Rasp, I suggest you'll use the following script to fetch the latest and largest OUI available database.
The script should be run at every start-up or at least once a month.
<sxh bash;> ~:$ </sxh>
<sxh bash;> #/bin/bash TIMESTAMP=$(date +"%y-%m-%d @ %H-%M")
if [ -e "/etc/mac-manuf" ]; then
echo "File has changed. Fetching update..." wget --timestamping --tries=3 --quiet -O /etc/mac-manuf https://anonsvn.wireshark.org/wireshark/trunk/manuf echo "$TIMESTAMP: Fetching OUI file update." >> /var/log/fmm.log
else
echo "Fetching file..." wget --timestamping --tries=3 --quiet -O /etc/mac-manuf https://anonsvn.wireshark.org/wireshark/trunk/manuf echo "$TIMESTAMP: Fetching OUI file for the first time." >> /var/log/fmm.log
fi </sxh>
get-oui for ethernet is also available. The original OUI db can be found here (3.2MB text file).