MAC Address Lookup
MAC Address Lookup
MAC Address Lookup is a free tool that identifies the vendor behind any MAC address or OUI prefix. Paste a full or partial address and the tool matches it against the complete IEEE Registration Authority registries (MA-L, MA-M, MA-S, IAB and CID) with longest-prefix matching, so small blocks resolve to the correct organization. Everything runs in your browser. The IEEE dataset loads as static files, all searching happens locally, and the addresses you look up are never sent to a server. There are no ads, no cookies, no accounts and no tracking. It also detects randomized and virtualized addresses, shows the ownership history of a prefix, lists every block of a vendor, and comes with a free MCP server for AI assistants.
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About MAC Address Lookup
MAC Address Lookup is a free web tool that identifies the vendor behind a MAC address or OUI prefix. A full or partial address can be pasted in, and the tool returns the vendor, IEEE block details, whether the address appears randomized or virtualized, and the lineage of the prefix.
Data comes from the IEEE Registration Authority registries, with historical changes sourced from runZero's mac-tracker project. Lookups run in the browser, and the site states that the addresses entered are never processed by a server. Beyond single lookups, the site offers browsing by countries, vendors, years, registry, regions, history, successors and the latest OUIs, plus a recent-lookups history that can be cleared. The interface is available in many languages, and the source code is published on GitHub.
For AI assistants, the tool provides a stateless MCP endpoint. Because MCP requests are sent over HTTP, the site notes that their privacy handling differs from browser lookups and points to its privacy policy. The tool suits network administrators, security researchers and developers who need to identify hardware vendors from MAC addresses.
Best for
- Network administrators identifying devices
- Security researchers analyzing MAC addresses
- Developers connecting AI assistants via MCP
- Privacy-conscious users needing local lookups
Pros
- Lookups run in the browser, not on a server
- Detects randomized and virtualized addresses
- Shows prefix lineage and historical ownership changes
- Open source, with interface in many languages
Cons
- MCP endpoint requests are sent to a server, unlike browser lookups
Pricing
The tool is described as free.
MAC Address Lookup FAQ
- Is MAC Address Lookup free?
- Yes, the site describes it as a free MAC address lookup.
- Are the addresses I look up sent to a server?
- No, browser lookups run locally and are never processed by a server. The MCP endpoint is an HTTP request, so it is handled differently, as described in the privacy policy.
- Where does the vendor data come from?
- It comes from the IEEE Registration Authority registries, with historical changes from runZero's mac-tracker.
- Can it look up partial addresses?
- Yes, it accepts full or partial MAC addresses as well as OUI prefixes.
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