Lookup hardware manufacturers from MAC addresses using an offline IEEE OUI dataset. Normalize formats (colon, hyphen, dot, hex), expand EUI-48 to EUI-64, and analyze unicast vs multicast bits.
Loading tool...
OUI stands for Organizationally Unique Identifier. The first 3 bytes (24 bits) of a MAC address are assigned by IEEE to specific hardware manufacturers like Apple, Cisco, or Intel.
No. The IEEE OUI vendor dictionary is embedded directly in the tool, allowing 100% offline, zero-latency MAC lookups.
EUI-48 is standard 48-bit MAC addressing. EUI-64 expands it to 64-bit by inserting FFFE in the middle, commonly used for IPv6 stateless address autoconfiguration (SLAAC).
The MAC Address & OUI Lookup is a specialized, high-performance utility designed to streamline your digital workflow. Lookup hardware manufacturers from MAC addresses using an offline IEEE OUI dataset. Normalize formats (colon, hyphen, dot, hex), expand EUI-48 to EUI-64, and analyze unicast vs multicast bits. By offering an intuitive and highly efficient interface, this tool eliminates unnecessary complexity, allowing you to focus directly on getting results quickly and accurately.
Whether you are a professional software developer, a creative web designer, or an everyday student, leveraging reliable, zero-latency tools like the MAC Address & OUI Lookup can drastically reduce your manual effort. The primary benefit lies in its accessibility—it operates entirely within your browser without requiring heavy software installations or paid subscriptions.
As part of our commitment to your digital security, the MAC Address & OUI Lookup was engineered with a strict 100% privacy-first approach. All processing, calculations, and data formatting happen strictly on the client-side—right within your own web browser window. Your sensitive data, uploaded files, and inputs never leave your device, ensuring you are 100% secure from external server breaches, tracking, or unauthorized logging. We ensure high-fidelity accuracy in all computations, providing you with trustworthy, production-ready outputs.