About MAC Probe
A focused, fast MAC address intelligence service for network engineers, SOC analysts and asset-management teams.
What we do
MAC Probe maps hardware addresses to the organisations that registered them, in both directions, and explains the structure of the address while doing it. The service runs as a website and a REST API on the same database.
Where the data comes from
All vendor assignments originate from the public IEEE Registration Authority listings — the MA-L, MA-M, MA-S and CID registries. We download the published CSV files on a daily schedule, normalize them (uppercase hex, trimmed organisation names, country extraction) and upsert them into our database. Entries that registrants have marked private appear as "Private" in the IEEE files and are reproduced as such.
MACProbe is not affiliated with or endorsed by the IEEE.
Why longest-prefix matching matters
A 36-bit MA-S block sits inside a 24-bit block owned by the IEEE itself. A naive lookup on the first three octets returns "IEEE Registration Authority" instead of the real manufacturer. MACProbe always evaluates 36-bit, then 28-bit, then 24-bit prefixes, so small IoT vendors resolve correctly.
Accuracy and limits
- Locally administered addresses (LAA) and randomized phone MACs have no registered owner — we say so instead of guessing.
- Vendor names reflect the registrant at the time of assignment, which may predate mergers and renames.
- An OUI identifies the chipset or hardware registrant, not necessarily the brand on the box.
Contact
Technical questions, data corrections and invoicing: support@macprobe.com.