MAC Address Vendor Lookup — Find the Manufacturer
Look up a MAC address's manufacturer from its OUI prefix instantly — free, client-side vendor lookup covering major hardware and IoT chip makers.
🔒 100% Client-Side Processing
Your data is processed entirely in your browser and never transmitted to any server.
0 / 100M Limit
Common Use Cases
Identifying unknown devices on a network
Spot an unfamiliar MAC in your router's client list or a packet capture — look up its OUI to see whether it's a phone, IoT sensor, or something worth investigating.
Debugging IoT and dev-board connections
Confirm a device on your network is actually the Raspberry Pi or ESP32 board you just flashed, not a different device that grabbed the same DHCP lease.
Auditing asset inventories
Cross-check MAC addresses in an inventory export against their expected vendor to catch mislabeled or unauthorized hardware.
Frequently Asked Questions
- How does this identify the manufacturer?
- The first 6 hex digits (3 bytes) of a MAC address are its OUI — an ID block IEEE assigns to each manufacturer. This tool strips separators from whatever you paste, takes those first 6 hex digits, and matches them against a lookup table.
- Does this cover every manufacturer?
- No — this is a curated list of well-known vendors (major hardware makers, cloud providers, and IoT chip makers like Espressif and Raspberry Pi Trading), not the full IEEE registry of 30,000+ assigned blocks. If your prefix isn't recognised, check the official IEEE OUI registry at standards-oui.ieee.org for an exhaustive lookup.
- Why did two different MAC addresses return the same manufacturer?
- Large manufacturers are assigned many separate OUI blocks — Google, Amazon, and Espressif alone each have multiple prefixes in this list — so several unrelated devices from the same company will correctly show the same name.
- I need to pull MAC addresses out of a log file first — where do I do that?
- Use the Extract MAC Addresses tool to pull every MAC-shaped string out of pasted text, then paste individual results here to identify each manufacturer.
- Is my data private when I use this tool?
- Yes. This tool runs entirely in your browser using client-side JavaScript — nothing you type is transmitted to, logged by, or stored on any server. You can safely process confidential text, tokens, or code.