MAC Vendor Lookup
Identifies the hardware vendor from a MAC address OUI prefix and normalises the address format.
Reformats a MAC address into every spelling, reads the flag bits, names the manufacturer where it can, and derives the modified EUI-64 and the IPv6 link-local address. The local bit is read before any vendor lookup, because a randomised phone address has no manufacturer and saying "unknown" for it is the wrong answer.
Colons, hyphens, Cisco dots, or none at all — all of them are accepted.
Vendor
VMware
Matched on 00:0C:29 (24-bit assignment)
Every format
Colons, lowercase
00:0c:29:1a:2b:3c
Colons, uppercase
00:0C:29:1A:2B:3C
Hyphens, lowercase
00-0c-29-1a-2b-3c
Hyphens, uppercase (IEEE)
00-0C-29-1A-2B-3C
Cisco dotted quads
000c.291a.2b3c
No separators
000c291a2b3c
Modified EUI-64
02:0c:29:ff:fe:1a:2b:3c
FF:FE inserted in the middle, and the local bit inverted — which is why a 00 at the front becomes 02.
IPv6 link-local address
fe80::20c:29ff:fe1a:2b3c
What this interface would give itself with no router present.
IPv4 multicast group → MAC address
Maps to MAC
01:00:5e:00:00:fb
Only 23 of the group address’s 28 bits fit in the MAC, so 32 different groups share every multicast MAC. That overlap is a real and frequently baffling source of multicast traffic a host did not subscribe to.
Everything here is computed in this page from the address itself. The vendor table ships with the page, so nothing is looked up over the network — a MAC address identifies a specific device, and sending one to a lookup service is how a device gets tracked.
How to use it
Paste the address in whatever form you have
Colons, hyphens, Cisco dots or no separator at all — all read the same. A list can be converted in one go on the other tab.
Read the two flag pills first
Locally administered means the device chose the address itself. Multicast means it addresses a group rather than one interface. Both are read from single bits in the first octet, and both change what the rest means.
Take the IPv6 link-local when you need it
The modified EUI-64 puts FF:FE in the middle and inverts the local bit, which is why a leading 00 becomes 02. The link-local address is what the interface gives itself with no router present.
Common questions
Why is the vendor unknown for my phone?
Because it has none. Modern phones randomise their MAC address per network to stop shops tracking them, and a randomised address has the local bit set — no manufacturer was ever assigned it. That is the correct answer, not a failed lookup.
Is the address sent anywhere to look it up?
No. The vendor table ships with the page. A MAC address identifies a specific device, and sending one to a lookup service is precisely how a device gets tracked.
The prefix is real but not in the table
The IEEE registry holds around 35,000 assignments and the full list is several megabytes, so the common ones ship and the rest do not. An absent prefix is a gap in the table, not a claim about the address.
Can I find a device from its MAC address?
No. It is not routable — it never travels past the first router — and no public registry maps an address to an owner. What the prefix gives you is the manufacturer, and only when the address was assigned by one.
Feed it from
My Connection Info
Shows your public IP, its network and everything this tab reveals — browser, screen, language, time zone, connection — and names what a website genuinely cannot see, starting with your MAC address.
IP Address Info
Shows your public IP or any address with its reverse name, ASN, announcing network, prefix and registry country from Team Cymru’s DNS data — no city-level geolocation.
WHOIS Lookup
Shows domain registration, registrar, nameservers and expiry, plus RDAP data where it exists.
QR & Barcode Reader
Reads QR codes and common barcodes from an uploaded image, a screenshot or the camera.
Next
These accept what this tool produces, so the result can go straight in.
IP Address Info
Shows your public IP or any address with its reverse name, ASN, announcing network, prefix and registry country from Team Cymru’s DNS data — no city-level geolocation.
Subnet Calculator
Expands a CIDR block into network, broadcast, usable range and host count, for IPv4 and IPv6.
HTTP Request Builder
Composes and sends a GET/POST/PUT/PATCH/DELETE/HEAD request with custom headers and a body, and shows the status, headers, body and timing — without ever forwarding cookies or Authorization.
Barcode Generator
Generates EAN-13, UPC, Code128, Code39 and ITF barcodes with check digits and print-ready output.
CSV Cleaner
Trims cells, normalises headers, fixes number and date formats and reports rows with the wrong column count.
CSV Join
Joins two tables on a key column with inner, left, right or outer semantics and shows unmatched rows.