The unknown combinations that you see here do not have an associated device and need to be categorized.
A combination is a set composed of a DHCP fingerprint, DHCPv6 fingerprint DHCP vendor, DHCP enterprise, User Agent and a MAC vendor.
These combinations have an associated device (usually representing the OS) and OS version.
You can submit an unknown combination using the 'Submit Combination' button.

Search:
By default, the search uses a like to match the entries. This means that it searches for partial matching.
To have your query match the beginning add ^ at the beginning of your query.
To have your query match the end add $ at the end of your query.
To negate your query put it inside !(). So if your query was ^android, it would become !(^android)