Look up the manufacturer behind any MAC address or OUI, straight from IEEE's public registries (MA-L, MA-M, MA-S, IAB, CID), refreshed daily.
\nThe Start here folder needs no API key. Send GET Vendor name and the whole response body is the vendor, as plain text. Free for 1,000 lookups per UTC day per IP.
apiKey collection variable, or import the macadress.com API environment and set it there.The collection sends it as Authorization: Bearer automatically.
The keyless GET /v1/vendor/:mac endpoint has its own budget: 1,000 per UTC day per IP, plus 60 per minute. Full detail at https://macadress.com/docs.
AA:BB:CC:DD:EE:FF, AA-BB-CC-DD-EE-FF, aabb.ccdd.eeff, AA BB CC DD EE FF, or AABBCCDDEEFF. Case does not matter.
GET https://api.macadress.com/v1/vendor/:mac
The registered vendor name as plain text, and nothing else. No API key, no signup. A one-liner:
\ncurl https://api.macadress.com/v1/vendor/00:03:93:AB:12:34\nFree: 1,000 lookups per UTC day per IP, plus 60 requests/minute. Send an apiKey and the daily cap becomes your plan's cycle quota instead (the first 1,000/day still do not draw it down).
Responses set Access-Control-Allow-Origin: *, so browser code can call this directly, and a cacheable Cache-Control. How it compares to other free MAC vendor APIs: https://macadress.com/free-mac-address-api
A MAC address in any common format, or a bare OUI like 00:03:93.
\n","type":"text/plain"},"type":"any","value":"00:03:93:AB:12:34","key":"mac"}]}},"response":[{"id":"189099eb-23d3-46a7-b339-92a4ae015133","name":"200 registered vendor","originalRequest":{"method":"GET","header":[],"url":"https://api.macadress.com/v1/vendor/00:03:93:AB:12:34"},"status":"OK","code":200,"_postman_previewlanguage":"text","header":[{"key":"Content-Type","value":"text/plain; charset=utf-8"},{"key":"Cache-Control","value":"public, max-age=86400"},{"key":"Access-Control-Allow-Origin","value":"*"},{"key":"X-Data-Version","value":"2026-08-30"}],"cookie":[],"responseTime":null,"body":"Apple, Inc."},{"id":"beee889f-9450-44bb-8baa-952220ea5496","name":"404 not registered","originalRequest":{"method":"GET","header":[],"url":"https://api.macadress.com/v1/vendor/FF:FF:FF:FF:FF:FF"},"status":"Not Found","code":404,"_postman_previewlanguage":"text","header":[{"key":"Content-Type","value":"text/plain; charset=utf-8"}],"cookie":[],"responseTime":null,"body":"not registered"},{"id":"486bc4de-40bc-4549-ad91-0e6592c2278a","name":"400 invalid mac address","originalRequest":{"method":"GET","header":[],"url":"https://api.macadress.com/v1/vendor/not-a-mac"},"status":"Bad Request","code":400,"_postman_previewlanguage":"text","header":[{"key":"Content-Type","value":"text/plain; charset=utf-8"}],"cookie":[],"responseTime":null,"body":"invalid mac address"}],"_postman_id":"b3aa04c9-1023-4250-903c-ad3f1bce8dda"},{"name":"Health check","event":[{"listen":"test","script":{"type":"text/javascript","exec":["pm.test(\"Status is 200\", function () { pm.response.to.have.status(200); });","pm.test(\"status is ok\", function () {"," pm.expect(pm.response.json().status).to.eql(\"ok\");","});"],"id":"7852ebe2-970f-42a9-a924-5596bac30aad"}}],"id":"656ee8f8-3ad5-4083-8454-5163268950f0","protocolProfileBehavior":{"disableBodyPruning":true},"request":{"auth":{"type":"noauth","isInherited":false},"method":"GET","header":[],"url":"https://api.macadress.com/v1/healthz","description":"GET https://api.macadress.com/v1/healthz
200 {\"status\":\"ok\"} when the database is reachable, 503 otherwise. No key, not counted against any quota. Meant for uptime checks.
Endpoints that work right now with nothing configured. Great for a quick demo or browser-side code.
\nThe star is GET Vendor name: the whole response body is the vendor, as text. When you want the full JSON analysis, create a free key at https://macadress.com/signup and open the next folder.
GET https://api.macadress.com/v1/mac/:mac (needs apiKey)
The full analysis of one address: vendor, registry block, address range, transmission and administration type, EUI-64 and IPv6 link-local derivation, randomization and virtualization signals, device-category inference, and a plain-English explanation.
Every field beyond the original v1 set is additive and nullable. Field-by-field reference: https://macadress.com/docs
\nGet a free key: https://macadress.com/signup
\n","auth":{"type":"bearer","bearer":{"basicConfig":[{"key":"token","value":""}]},"isInherited":true,"source":{"_postman_id":"48eb792c-4670-401a-8f78-018e979e983b","id":"48eb792c-4670-401a-8f78-018e979e983b","name":"macadress.com MAC Address and OUI Vendor Lookup API","type":"collection"}},"urlObject":{"path":["v1","mac",":mac"],"host":["https://api.macadress.com"],"query":[],"variable":[{"id":"5fc132c0-8fbe-43ef-8080-73a82e0c5115","description":{"content":"A MAC address in any common format (colon, dash, dot-grouped, spaced, or bare hex), case-insensitive.
\n","type":"text/plain"},"type":"any","value":"00:03:93:AB:12:34","key":"mac"}]}},"response":[{"id":"5c17da57-f430-4f44-9b4a-b91c079b7b6e","name":"200 lookup result","originalRequest":{"method":"GET","header":[{"key":"Authorization","value":"Bearer "}],"url":"https://api.macadress.com/v1/mac/00:03:93:AB:12:34"},"status":"OK","code":200,"_postman_previewlanguage":"json","header":[{"key":"Content-Type","value":"application/json"},{"key":"X-Data-Version","value":"2026-08-30"},{"key":"X-Request-Id","value":"5249ebff-787d-4776-97c3-235a8c95823c"}],"cookie":[],"responseTime":null,"body":"{\n \"mac\": \"00:03:93:AB:12:34\",\n \"valid\": true,\n \"oui\": \"00:03:93\",\n \"organization\": \"Apple, Inc.\",\n \"vendor_address\": \"1 Infinite Loop Cupertino CA US 95014\",\n \"country\": \"US\",\n \"block_type\": \"MA-L\",\n \"address_capacity\": 16777216,\n \"range_start\": \"00:03:93:00:00:00\",\n \"range_end\": \"00:03:93:FF:FF:FF\",\n \"registered\": true,\n \"transmission_type\": \"unicast\",\n \"administration_type\": \"universally_administered\",\n \"locally_administered\": false,\n \"slap_quadrant\": null,\n \"eui64\": \"02:03:93:FF:FE:AB:12:34\",\n \"ipv6_link_local\": \"fe80::203:93ff:feab:1234\",\n \"potentially_randomized\": false,\n \"randomization_confidence\": \"none\",\n \"vendor_lookup_reliable\": true,\n \"is_zero\": false,\n \"is_broadcast\": false,\n \"explanation\": \"This is a universally administered unicast address with a registered vendor prefix.\",\n \"is_private\": false,\n \"matched_prefix\": \"00:03:93\",\n \"prefix_length\": 24,\n \"registry\": { \"source\": \"IEEE\", \"record_type\": \"MA-L\", \"record_updated_at\": null, \"database_synced_at\": \"2026-08-30T03:10:00Z\" },\n \"device\": { \"category\": \"consumer_electronics\", \"possible_categories\": [\"smartphone\", \"tablet\", \"computer\", \"media_device\"], \"confidence\": \"medium\", \"inference_source\": \"vendor_profile\", \"exact_model_known\": false },\n \"virtualization\": { \"detected\": false, \"platform\": null, \"confidence\": \"none\", \"signals\": [] },\n \"special_use\": { \"detected\": false, \"type\": null, \"protocol\": null, \"name\": null, \"source\": null, \"confidence\": \"none\" },\n \"vendor_location\": { \"raw\": \"1 Infinite Loop Cupertino CA US 95014\", \"address_line\": null, \"city\": null, \"region\": null, \"postal_code\": null, \"country_code\": \"US\", \"country_name\": \"United States\", \"parse_confidence\": \"low\" },\n \"randomization\": { \"potentially_randomized\": false, \"confidence\": \"none\", \"signals\": [], \"alternative_explanations\": [] },\n \"local_vendor_derivation\": { \"detected\": false, \"method\": \"\", \"universal_mac\": null, \"confidence\": \"none\", \"organization\": null, \"country\": null, \"matched_prefix\": null, \"block_type\": null, \"lookup_url\": null, \"device\": null, \"signals\": [] },\n \"assignment\": { \"registered_at\": null, \"first_seen_at\": \"2026-08-22\", \"last_changed_at\": \"2026-08-22\" },\n \"vendor\": { \"id\": \"apple-inc\", \"registered_name\": \"Apple, Inc.\", \"canonical_name\": \"Apple, Inc.\", \"slug\": \"apple-inc\", \"block_count\": 1553, \"lookup_url\": \"https://macadress.com/vendor/000393\" },\n \"meta\": { \"request_id\": \"5249ebff-787d-4776-97c3-235a8c95823c\", \"api_version\": \"v1\", \"database_version\": \"2026-08-30\", \"processed_at\": \"2026-08-30T10:26:47Z\", \"cached\": true }\n}"},{"id":"e8f24e7d-7cb4-4fc6-bb97-061c80d9abdd","name":"400 invalid input","originalRequest":{"method":"GET","header":[{"key":"Authorization","value":"Bearer "}],"url":"https://api.macadress.com/v1/mac/not-a-mac"},"status":"Bad Request","code":400,"_postman_previewlanguage":"json","header":[{"key":"Content-Type","value":"application/json"}],"cookie":[],"responseTime":null,"body":"{\n \"valid\": false,\n \"error\": \"invalid MAC address\",\n \"request_id\": \"19ee676c-4410-443f-813e-3bbb3433b4bf\"\n}"},{"id":"51f98565-e5a7-44a6-b5ee-4073c76729b6","name":"401 missing API key","originalRequest":{"method":"GET","header":[],"url":"https://api.macadress.com/v1/mac/00:03:93:AB:12:34"},"status":"Unauthorized","code":401,"_postman_previewlanguage":"json","header":[{"key":"Content-Type","value":"application/json"}],"cookie":[],"responseTime":null,"body":"{\n \"error\": \"missing API key: pass it as \\\"api_key\\\" (query param or POST body) or an Authorization: Bearer header\"\n}"}],"_postman_id":"078e4409-0ecb-4cbb-a403-66fb7f977a59"},{"name":"Look up many MAC addresses","event":[{"listen":"test","script":{"type":"text/javascript","exec":["pm.test(\"Status is 200\", function () { pm.response.to.have.status(200); });","const body = pm.response.json();","pm.test(\"count matches results length\", function () {"," pm.expect(body.count).to.eql(body.results.length);","});","pm.test(\"Each result carries its input\", function () {"," body.results.forEach(function (r) { pm.expect(r).to.have.property(\"input\"); });","});"],"id":"d8eb86b8-7e98-4bb6-989d-6d1d1429569b"}}],"id":"33dab2c3-8bd1-463a-9471-19e0018ab888","protocolProfileBehavior":{"disableBodyPruning":true},"request":{"method":"POST","header":[{"key":"Content-Type","value":"application/json"}],"body":{"mode":"raw","raw":"{\n \"macs\": [\n \"00:03:93:AB:12:34\",\n \"F4:5C:89:AA:BB:CC\",\n \"not-a-mac\"\n ]\n}","options":{"raw":{"language":"json"}}},"url":"https://api.macadress.com/v1/mac/batch","description":"POST https://api.macadress.com/v1/mac/batch (needs apiKey)
Look up to 100 addresses in one request. A bad entry does not fail the batch: each result carries its own status.
\n{ \"macs\": [\"00:03:93:AB:12:34\", \"F4:5C:89:AA:BB:CC\"] }\nEach entry has the same shape as GET /v1/mac/:mac plus input, and error on failure. Every entry in one call shares the same meta.request_id. Billed per address actually looked up, not per request. You can also send the key inline as an \"api_key\" field in the body. Docs: https://macadress.com/docs
POST https://api.macadress.com/v1/mac/extract (needs apiKey)
Scan free-form text (arp -a output, log dumps, DHCP leases) for anything that looks like a MAC address and look up every one found, up to 100.
{ \"text\": \"? (192.168.1.1) at 00:03:93:ab:12:34 on en0 [ethernet]\" }\nAddresses are deduplicated and returned in first-seen order. truncated is true if more than 100 distinct addresses were present. Bills per address looked up, same as batch. Docs: https://macadress.com/docs
GET https://api.macadress.com/v1/vendors (needs apiKey)
Search the registered vendor/block directory by organization name substring and/or country. Returns registered, non-private blocks only. Counts as one call against your quota.
\ntotal is how many blocks match, independent of limit. Omitting both query and country matches the whole registry (about 58k non-private blocks), not an error. Docs: https://macadress.com/docs
Optional. Substring match against organization name, case-insensitive.
\n","type":"text/plain"},"key":"query","value":"Apple"},{"description":{"content":"Optional. Exact ISO 3166-1 alpha-2 code, e.g. US, DE, JP.
\n","type":"text/plain"},"key":"country","value":"US"},{"description":{"content":"Optional. Max results, default 10, capped at 50.
\n","type":"text/plain"},"key":"limit","value":"10"}],"variable":[]}},"response":[{"id":"d7504dc6-54a2-47aa-bdab-4b1f79e46f1a","name":"200 matching blocks","originalRequest":{"method":"GET","header":[{"key":"Authorization","value":"Bearer "}],"url":{"raw":"https://api.macadress.com/v1/vendors?query=Apple&country=US&limit=10","host":["https://api.macadress.com"],"path":["v1","vendors"],"query":[{"key":"query","value":"Apple"},{"key":"country","value":"US"},{"key":"limit","value":"10"}]}},"status":"OK","code":200,"_postman_previewlanguage":"json","header":[{"key":"Content-Type","value":"application/json"}],"cookie":[],"responseTime":null,"body":"{\n \"total\": 1553,\n \"blocks\": [\n {\n \"prefix_int\": 915,\n \"mask_bits\": 24,\n \"block_type\": \"MA-L\",\n \"organization\": \"Apple, Inc.\",\n \"address\": \"1 Infinite Loop Cupertino CA US 95014\",\n \"country\": \"US\",\n \"is_private\": false,\n \"first_seen_at\": \"2026-08-22T14:26:39Z\",\n \"last_changed_at\": \"2026-08-22T14:26:39Z\"\n }\n ]\n}"}],"_postman_id":"5b1d8253-3644-49cb-b5e1-a82b4c45fa04"}],"id":"a4b89e2f-f698-4998-aaf0-4aecbac2609f","description":"The full JSON API. Set the apiKey collection variable first, or import the macadress.com API environment: get one free at https://macadress.com/signup, copy it from https://macadress.com/account. It is sent automatically as Authorization: Bearer .
Free plan: 30 requests/minute, 1,000 lookups per 30-day cycle. More at https://macadress.com/pricing.
\n","event":[{"listen":"prerequest","script":{"type":"text/javascript","exec":["if (!pm.collectionVariables.get(\"apiKey\") && !pm.environment.get(\"apiKey\")) {"," console.warn(\"No apiKey set. Get a free key at https://macadress.com/signup and put it in the apiKey variable (or an environment).\");","}"],"id":"1e7a0261-3f20-439a-b24f-70af99338199"}}],"_postman_id":"a4b89e2f-f698-4998-aaf0-4aecbac2609f","auth":{"type":"bearer","bearer":{"basicConfig":[{"key":"token","value":""}]},"isInherited":true,"source":{"_postman_id":"48eb792c-4670-401a-8f78-018e979e983b","id":"48eb792c-4670-401a-8f78-018e979e983b","name":"macadress.com MAC Address and OUI Vendor Lookup API","type":"collection"}}}],"auth":{"type":"bearer","bearer":{"basicConfig":[{"key":"token","value":""}]}},"event":[{"listen":"test","script":{"type":"text/javascript","exec":["// Runs after every request in the collection.","const dv = pm.response.headers.get(\"X-Data-Version\");","if (dv) { pm.collectionVariables.set(\"lastDataVersion\", dv); }","","pm.test(\"Response time is under 2000ms\", function () {"," pm.expect(pm.response.responseTime).to.be.below(2000);","});"],"id":"1f195e2e-d155-45b6-92cd-af9f2b0d57a7"}}],"variable":[{"key":"baseUrl","value":"https://api.macadress.com","description":"API host. No trailing slash."},{"key":"apiKey","value":"","description":"Your macadress.com API key (starts with mk_). Free key at https://macadress.com/signup, visible on https://macadress.com/account. Not needed for the Start here folder."},{"key":"sampleMac","value":"00:03:93:AB:12:34","description":"A MAC address to demo with. This one is an Apple MA-L block."},{"key":"sampleOui","value":"00:03:93","description":"A bare 24-bit OUI. The vendor name endpoint accepts this too."},{"key":"vendorQuery","value":"Apple","description":"Organization name substring for GET /v1/vendors."},{"key":"country","value":"US","description":"ISO 3166-1 alpha-2 country filter for GET /v1/vendors."},{"key":"lastVendorName","value":"","description":"Captured by the Vendor name request on a 200."},{"key":"lastOrganization","value":"","description":"Captured by the single MAC lookup when a vendor is found."},{"key":"lastDataVersion","value":"","description":"Captured from the X-Data-Version header on every response: the date the vendor database last synced."}]}