📡 MAC Address Lookup

Look up any MAC address to find the device manufacturer using the official IEEE OUI registry with 45,000+ registered vendors.

Network Tool

45K+ OUIs

IEEE Official

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Look up a MAC address

Accepts colon ( : ), dash ( - ), dot ( . ) or no separator — case-insensitive. OUI-only prefix (6 chars) also supported.

Bulk lookup — up to 200 MACs

Paste multiple MAC addresses, one per line. Any format accepted.

🔐 What is an OUI?

The first 3 bytes (6 hex digits) of a MAC address are the OUI — Organizationally Unique Identifier. IEEE assigns each manufacturer a unique block so the prefix reveals who made the device.

🔄 MAC address structure

XX:XX:XX:YY:YY:YY — first 3 bytes = vendor OUI, last 3 bytes = unique serial assigned by the manufacturer. Total 48-bit globally unique identifier.

📱 Randomized MACs

iOS 14+, Android 10+, and Windows 10+ use randomized MAC addresses when scanning for Wi-Fi. The locally administered bit (2nd LSB of first byte) is set to 1 — these won't match any real vendor OUI.

📄 IEEE Block types

MA-L (24-bit): Most common, ~16M addresses per block.
MA-M (28-bit): Medium assignment, ~1M addresses.
MA-S (36-bit): Small, ~4096 addresses — used by small vendors.

Browse IEEE vendor database — 0 entries

OUI Prefix	Manufacturer
Type a vendor name or OUI to search the database.

Showing up to 100 results per search. Source:

OUI data sourced from the IEEE Registration Authority. Updated weekly. For legitimate network administration and device identification purposes only.