Zellio.io

MAC Address Analyzer

Identify the vendor and decode any MAC address — OUI, cast and UAA/LAA.

Processed locally — nothing is uploaded

About MAC Address Analyzer

A locally administered bit is what phone MAC randomisation sets, which is why a vendor lookup returns nothing for many devices on a network scan. That is the feature working as intended rather than a failed lookup.

Every network interface has a 48-bit MAC address whose first 24 bits — the OUI (Organizationally Unique Identifier) — are assigned by the IEEE to a specific manufacturer. This analyzer looks that OUI up against the full IEEE registry to name the vendor, then decodes the rest of the address: it splits the OUI and NIC portions, reads the individual/group bit to tell you whether the address is unicast or multicast, and reads the universal/local bit to show whether it is universally administered (UAA, burned in) or locally administered (LAA, software-set).

It also normalises the address into every common notation — colon, hyphen, Cisco dot and bare — and derives the Modified EUI-64 interface identifier used in IPv6. The IEEE vendor database is fetched only when this tool is opened, so no other page pays for it.

Learn how this works

Understanding Your IP Address & Network BasicsWhat your public IP reveals, how to check it, and what latency means — explained simply, with a free in-browser network tester.6 min read

Frequently asked questions

How is the manufacturer identified?

The first three bytes of the MAC (the OUI) are matched against the public IEEE OUI registry of roughly 40,000 vendor assignments. If a prefix isn't in the registry (or is locally administered), the tool says so rather than guessing. This lookup lets you instantly identify which vendor manufactured a network interface, useful for inventory tracking, security auditing, or understanding what devices are on your network. The OUI registry is the authoritative source for MAC vendor information and is updated regularly as manufacturers receive new allocations.

What do unicast/multicast and UAA/LAA mean?

The lowest bit of the first byte marks the address as unicast (one interface) or multicast (a group). The next bit marks it as universally administered (assigned by the manufacturer) or locally administered (set by software or a VM/hypervisor). Unicast addresses are used for normal device-to-device communication, while multicast addresses deliver packets to multiple devices at once (like Ethernet broadcasts). Locally administered addresses (LAA) are often used in virtual machines, while universally administered addresses (UAA) are burned into network interface hardware by the manufacturer and never change.

Is my MAC address uploaded?

No. Everything runs locally in your browser using standard web APIs — your text, files and inputs are never uploaded to a server, so the tool works even offline once the page has loaded.

More MAC Address Analyzer tools

MAC Address Vendor LookupOUI Lookup

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