Best free MAC address (OUI) vendor lookup tools
All four tools in this comparison look up a MAC address's IEEE-registered vendor for free with no account: macvendors.com and maclookup.app also publish developer APIs, and maclookup.app's own docs already flag locally-administered or randomized addresses and report the IEEE block size the way AdminKit's MAC vendor lookup does.
What each tool actually offers
macvendors.com, read 2026-11-03, states plainly that a lookup needs “no registration or api key necessary for up to 1,000 requests per day,” covers “over 16,500 registered vendors,” and offers paid plans for users past that free API quota. Its homepage makes no mention of flagging locally-administered or randomized addresses, and no mention of the IEEE’s MA-L/MA-M/MA-S block-size distinction, anywhere on the page.
maclookup.app, also read 2026-11-03, describes itself as a way to “search for MAC address prefixes and matches them to the chipset’s manufacturer,” via a “Zero Auth Public Tier” that gives “instant public access without API keys, tokens, or registration,” plus a documented REST API with its own rate-limits page. Its own example API response already includes isRand and isPrivate fields, and its page breaks a match down by IEEE allocation type — “MA-L (24-bit Prefix), MA-S (36-bit Prefix), MA-M (28-bit Prefix), IAB (36-bit Legacy), CID (24-bit Company ID)” — the same kind of randomization flag and block-size detail AdminKit’s MAC vendor lookup reports.
Wireshark’s OUI Lookup tool, read 2026-11-03, is a small search page inside the broader Wireshark packet-capture and protocol-analysis project’s own site. The page describes itself only as a way to “easily search for vendor information using Organizationally Unique Identifiers (OUIs)” — it states nothing about an account requirement, its data source, or randomized-address detection, so this page marks those three points unverified for Wireshark specifically rather than assuming an answer either way.
The honest angle
This isn’t a ranking. macvendors.com and maclookup.app are close matches for what AdminKit’s tool does: free, no-account lookups against the same kind of registry data. maclookup.app in particular already documents the same locally-administered/randomized flag and IEEE block-size detail AdminKit highlights as its own differentiator — on those two specific points, this is a place where AdminKit cannot honestly claim an edge. Where AdminKit differs from both is scope: no separate developer API product, just one free check bundled into AdminKit’s own smaller set of network tools. Wireshark’s OUI Lookup is a different kind of product altogether — one utility page belonging to a full packet-analysis application, not a dedicated vendor-lookup site.
See how MAC randomization affects a lookup like this for why none of these four tools will reliably identify a modern phone, and using MAC vendor lookup to spot a rogue device for the practical walkthrough of combining a result with other context.
Trademarks belong to their respective owners; AdminKit is not affiliated with macvendors.com, maclookup.app or the Wireshark Foundation.
| Feature | AdminKit | macvendors.com | maclookup.app | Wireshark OUI Lookup |
|---|---|---|---|---|
| Free single MAC address lookup with no account required | ✓ | ✓ | ✓ | ✓ |
| Documented free public API for developers | — | ✓ | ✓ | — |
| Flags locally-administered or randomized addresses (no vendor to find) | ✓ | — | ✓ | — |
| Reports the IEEE assignment block size (MA-L / MA-M / MA-S) | ✓ | — | ✓ | — |
| Bundled inside a much larger general-purpose tool or site, not a dedicated MAC lookup product | — | — | — | One page within the wider Wireshark project (own site) |
AdminKit vs macvendors.com
Documented free public API for developers
Flags locally-administered or randomized addresses (no vendor to find)
Reports the IEEE assignment block size (MA-L / MA-M / MA-S)
AdminKit vs maclookup.app
Documented free public API for developers
AdminKit vs Wireshark OUI Lookup
Flags locally-administered or randomized addresses (no vendor to find)
Reports the IEEE assignment block size (MA-L / MA-M / MA-S)
Bundled inside a much larger general-purpose tool or site, not a dedicated MAC lookup product
Frequently asked questions
Which of these four MAC/OUI lookup tools should I use?
This page doesn't rank them. macvendors.com and maclookup.app are both free, no-account MAC vendor lookups backed by the same kind of IEEE OUI data AdminKit's tool uses; maclookup.app's own docs already report the IEEE block size and flag randomized/locally-administered addresses the same way AdminKit does. Wireshark's OUI Lookup is a single utility page on the much broader Wireshark packet-analysis project's site, not a dedicated lookup product. AdminKit's MAC vendor lookup is one free check in AdminKit's own smaller set of network tools.
Does macvendors.com flag locally-administered or randomized MAC addresses?
Unverified. Its own homepage (macvendors.com, read 2026-11-03) describes the manufacturer lookup and its free/paid API tiers in detail but never mentions randomized or locally-administered address detection either way, so this page marks that as unknown rather than assuming macvendors.com lacks the feature. AdminKit's MAC vendor lookup flags these explicitly, since a randomized address has no registered vendor to find.
Is maclookup.app's own feature set really this close to AdminKit's?
On the two points this page can verify from maclookup.app's own homepage (read 2026-11-03), yes: its documented API response includes isRand/isPrivate fields and breaks a match down by IEEE allocation type (MA-L/MA-M/MA-S plus the legacy IAB/CID blocks), which is substantively the same detail AdminKit's own tool page states it reports. The concrete difference is scope: AdminKit's check is bundled into AdminKit's own set of free network tools with no separate developer API product, where maclookup.app documents a public REST API with its own rate-limits page.
Does Wireshark's OUI Lookup page say where its data comes from, or whether it flags randomized addresses?
No — unverified either way. The page at wireshark.org/tools/oui-lookup.html (read 2026-11-03) only describes itself as letting you "easily search for vendor information using Organizationally Unique Identifiers (OUIs)"; it does not state its data source or mention locally-administered/randomized address detection, so this page does not assume an answer for Wireshark specifically on either point.
Does this page use macvendors.com's, maclookup.app's or Wireshark's logo or brand assets?
No. All three names are used only to identify and compare publicly available tools (nominative use). AdminKit is not affiliated with or endorsed by macvendors.com, maclookup.app or the Wireshark Foundation.
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