IEEE MAC assignment datasets

Current snapshot

58,735 unique assignments. Version b3b752b34180, captured 2026-09-17T09:29:27.097Z. The version comes from the committed record content; it changes when records change.

The source-row counts precede deduplication, so their sum can be higher than the unique total.

Download and verify

The SHA-256 values below describe the exact bytes in each file. Use a local hash tool to compare the downloaded file before you import it.

The original compressed NDJSON and snapshot metadata are also available as NDJSON.gz and meta.json. All files are static downloads; no API account is needed.

Provenance and interpretation

The pipeline reads the public IEEE MA-L, MA-M, MA-S, IAB and CID registries, validates their boundaries, and preserves narrower assignments inside wider parent blocks. When several blocks cover an address, prefer the narrowest matching block. The JSON and CSV files contain the same record fields, including start and end addresses, registrant, country and registry type.

• IEEE MA-L registry
• IEEE MA-M registry
• IEEE MA-S registry
• IEEE IAB registry
• IEEE CID registry

A registry assignment identifies the organization that registered a block. It does not establish the maker, owner or current user of a device. Locally administered addresses can mask that assignment, and the snapshot may lag IEEE changes after its capture time.

For a single address, MAC inspector performs the narrowest-block lookup locally. The interactive datasets tool also offers copyable checksums.