This server is a in-memory database that allows to look up manufacturer information based on a MAC address. The library is very lightweight, and allows for million of lookups per second. You can add the database by specifying a file or a URL where the data can be downloaded from. The server support non-interuptible updates and can update the database while the server is running.
An Organizationally Unique Identifier (OUI) is a 24-bit number that uniquely identifies a vendor, manufacturer, or other organization globally or worldwide.
This server instance defaults to downloading the database and updating it daily. The server is exposed on port 5000.
See more here: Using the server