Is a small service offered via http to look up mac addresses to vendors. It uses Wireshark's oui database, reading the whole content into memory and serving requests over http, replying with a single text content.
$ docker run -it --rm -p 3000:3000 ghcr.io/rkojedzinszky/mac2vendor
To access:
$ curl http://127.0.0.1:3000/F0:41:C8:A0:00:00
IeeeRegi
$ curl http://127.0.0.1:3000/00:02:4B
Cisco
To request json output, you can specify it in the request:
$ curl http://127.0.0.1:3000/F0:41:C8:A0:00:00?format=json
{"prefix":"F0:41:C8","vendor":"IeeeRegi","comments":"IEEE Registration Authority"}
A free live service is available here.