We dropped the extra D. Not the details.
Free MAC Address Lookup and Vendor Finder
Enter any MAC address or OUI to find its registered organization, IEEE assignment, block range, country, and address type. We also identify locally administered addresses and flag when one may be randomized.
The web lookup is free and requires no account, in any format: colons, dashes, dots, or none at all. The API includes 1,000 free lookups a month, with paid plans for production volume.
See it in action
Real data, not a mockup.
Every lookup gets this: not just a vendor name, but the reasoning behind it. This one's live, pulled from the registry on every page load.
What does a MAC address lookup reveal?
- The registered organization or vendor
- The IEEE assignment type: MA-L, MA-M, MA-S, IAB, or CID
- The registered prefix and block range
- The registered country and address, when published
- Whether the address is unicast or multicast
- Whether the address is universally or locally administered
- Indicators that the address may be randomized
What can't a MAC address lookup reveal?
- Who owns or uses the device
- The device's current physical location
- Its public IP address
- The exact device model, in most cases
- Whether the device is online right now
What we actually sell
Free to try. Two ways to run it for real.
The MAC vendor lookup above is free, unlimited, no account required. Production traffic and environments where lookups can't leave the network need one of these two instead.
Hosted API
Pay for volume, not features
Every plan gets the full response: randomization confidence, IEEE 802c classification, EUI-64/IPv6 derivation. Paid tiers buy requests per minute and lookups per month, not depth.
See the API →Self-hosted
Install it, run it on your own infrastructure
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? →Why, not just who
Every result comes with a reason
Most lookup tools stop at a vendor name. We explain the address in plain English: what its bits actually mean, in a sentence a human can read.
Privacy-aware
We flag randomized addresses
Most modern phones and laptops can use randomized MAC addresses to reduce tracking across Wi-Fi networks. We detect likely randomization and tell you honestly how confident we are, not just yes or no.
Built for engineers
Real technical depth
Beyond the vendor name, every result explains the registered block, address type, and randomization indicators: IEEE 802c classification, EUI-64 and IPv6 link-local derivation, full block ranges and address capacity.
Just useful
Free lookups, fair use
The web tool needs no account, look up as many addresses as you like. The JSON API is free too, sign up for a key in seconds, that's how we keep it fast and fair as usage grows.
Beyond the vendor name, every result explains the registered block, address type, and randomization indicators.
FAQ
Common questions
Is there a free MAC address lookup API?
Yes. macadress is a free MAC address API: 1,000 lookups a month at no cost, no card required. Sign up for a key and call GET /v1/mac/:mac or POST /v1/mac/batch, or use the web tool with no account at all.
Do I need to format the MAC address a specific way?
No. Both the API and the web tool accept AA:BB:CC:DD:EE:FF, AA-BB-CC-DD-EE-FF, AA BB CC DD EE FF, aabb.ccdd.eeff, or bare AABBCCDDEEFF, with or without spaces.
Can I look up multiple MAC addresses in one request?
Yes. POST /v1/mac/batch accepts up to 100 addresses per request and returns a result for each one, valid or not, see the API docs for the full shape.
What's the difference between a MAC address and an OUI?
The OUI is the first three octets (24 bits), IEEE's original vendor identifier. A registered block can be narrower than that classic /24 (MA-M and MA-S assignments go down to /28 and /36), so a lookup returns the OUI plus the full matched block.
Can a MAC address be randomized or spoofed?
Yes. Most modern phones and laptops randomize their MAC address for privacy on networks they haven't connected to before. Every lookup flags this with a confidence level, explained in plain English, not just a yes or no.