Developer API
MAC Address Lookup API: Vendor, OUI & Device Data
A JSON API for MAC address lookup, vendor identification, and OUI/IEEE block data. Look up one address or batch up to 100 at a time, self-host it if lookups can't leave your network.
1,000 free lookups a month, no card required, or skip the key entirely for name-only lookups. Sign up for a key or see plans.
A few endpoints, one lookup engine
GET /v1/vendor/:mac: the vendor name as plain text, no API key, 1,000 free a dayGET /v1/mac/:mac: a single MAC address or OUI lookup, full JSONPOST /v1/mac/batch: up to 100 addresses in one request, billed per address looked up- The same lookup and vendor directory as MCP tools an AI agent can call directly
What every result includes
- Registered organization, OUI, and full IEEE block (MA-L, MA-M, MA-S, IAB, or CID)
- Registered country and address, when published
- Administration type, transmission type, and IEEE 802c SLAP quadrant
- EUI-64 and IPv6 link-local derivation
- Randomization confidence, explained in plain English
Prefer a typed client to raw HTTP? See the client libraries: PHP (Laravel-ready), JavaScript/TypeScript, Go, Python, PowerShell, and C#.
Run it hosted or run it yourself
Two ways to put the API into production
The MAC address database behind this API is live-synced from IEEE, not a stale snapshot, whichever way you run it.
Hosted
api.macadress.com
Sign up, get a key instantly, and start calling the API. Paid tiers buy requests per minute and lookups per month, not extra fields in the response.
See API plans →Self-hosted
A self-hosted MAC lookup API
The same API and sync engine, licensed for your own servers. No lookup leaves your network. Your own infrastructure determines capacity.
Is it worth it? →FAQ
Common questions about the API
Is there a MAC address lookup API?
Yes. GET /v1/mac/:mac returns the registered vendor, OUI, IEEE block, country, and address type for one MAC address as JSON. 1,000 lookups a month are free, no card required; see /pricing for paid tiers and /docs for the full reference.
Is there a MAC address lookup API with no API key?
Yes. GET /v1/vendor/:mac returns just the vendor name as plain text, with no key and no signup, free for 1,000 lookups per day per IP. The keyed JSON endpoints add the OUI, IEEE block, country, randomization analysis, and more; a key also lifts that daily cap to your plan's quota.
Does the API support batch MAC address lookups?
Yes. POST /v1/mac/batch accepts up to 100 addresses in one request and returns a result for each, valid or not, billed per address looked up rather than per request.
Is this a MAC vendor API, an OUI lookup API, or both?
Both, from the same endpoint. Every registered result includes both the classic OUI (the first 3 octets) and the full matched IEEE block, since not every assignment is a /24: MA-M and MA-S blocks go down to /28 and /36.
How current is the MAC address database behind the API?
It's synced from IEEE's own registration records on a recurring schedule, not a one-time snapshot. Every response's meta.database_version and the X-Data-Version header report the date of the sync it was served from.
Is there a self-hosted MAC lookup API?
Yes. The same API and its sync engine are available as a self-hosted license for infrastructure where lookups can't leave the network. See /learn/self-hosted-mac-lookup for what that involves and whether it's worth it for your setup.