Bulk data
Download the MAC vendor database.
Every registered OUI block, in the formats other tools already expect. No signup, no API key.
Last rebuilt Aug 22, 2026 12:21 UTC, 58,247 blocks. These files are regenerated from the live registry on a schedule and served straight from disk, not recomputed per request: expect this timestamp to move at most twice a day.
| Format | What it's for | Size | |
|---|---|---|---|
Cisco vendorMacs.xmlcisco-vendor-macs.xml |
24-bit OUIs only, in the exact schema Cisco ISE device profiling imports: <MacAddressVendorMappings><VendorMapping mac_prefix="..." vendor_name="..."/></MacAddressVendorMappings>. How to use this → | 3.0 MiB | Download |
CSVvendors.csv |
Every registered block (MA-L, MA-M, MA-S, IAB, CID), one row each, prefix plus mask so 28- and 36-bit blocks aren't lossily truncated to 24 bits. How to use this → | 5.7 MiB | Download |
JSONvendors.json |
The same data as the CSV, as a single JSON array of objects, for anything that would rather parse JSON than CSV. How to use this → | 10.4 MiB | Download |
Wireshark manufmanuf.txt |
Drop-in replacement for Wireshark/tshark/tcpdump's manuf file: tab-separated prefix, short name, full name, sub-24-bit blocks written as full prefix + /mask. How to use this → | 3.4 MiB | Download |
Nmap mac-prefixesnmap-mac-prefixes.txt |
Drop-in replacement for nmap's nmap-mac-prefixes file (used for its -O/-A vendor guesses): 24-bit OUIs only, "XXXXXX Vendor Name" per line. How to use this → | 1.2 MiB | Download |
Step-by-step install guides
Each format above links to its own guide, or browse all of them on the Learn page: importing into Cisco ISE, updating Wireshark's manuf file, refreshing nmap's vendor guesses, and using the CSV/JSON files directly.
Need it live instead?
These are point-in-time snapshots. For a per-address lookup with the full IEEE 802c classification, randomization confidence, and EUI-64/IPv6 derivation, use the free JSON API or the web lookup instead.