Mac Address Lookup

Free online tool. All processing is client-side. No signup needed.

How to Use the Mac Address Lookup

1. Enter your input values above
2. Results update automatically
3. Copy or download the output

What is a Mac Address Lookup?

A MAC Address Lookup tool identifies the manufacturer of a network device from its MAC address's OUI (Organizationally Unique Identifier) — the first 24 bits (3 octets) assigned by IEEE to each hardware manufacturer. Every network-capable device has a MAC address with a manufacturer prefix: Apple devices start with specific codes, as do Samsung, Intel, Cisco, and every other manufacturer. This tool searches a regularly updated OUI database to identify who made a network device.

How Does It Work?

Enter a MAC address (full or just the first 6 hex digits/OUI). The lookup searches the IEEE OUI database and returns: (1) manufacturer/company name, (2) company address (for major manufacturers), (3) OUI type: MA-L (large, 24-bit), MA-M (medium, 28-bit), or MA-S (small, 36-bit). Examples: 00:1A:2B → Apple, 3C:5A:B4 → Google, F0:DB:F8 → Apple, 00:15:5D → Microsoft (Hyper-V).

Formula

MAC-48 (EUI-48): 48 bits total\nOUI: first 24 bits (3 octets) = manufacturer (MA-L assignment)\nNIC-specific: last 24 bits = device within manufacturer\n\nExtended assignments:\nMA-M (28-bit OUI): 2^20 (1M) addresses per assignment\nMA-S (36-bit OUI): 2^12 (4K) addresses per assignment\n\nLookup: OUI hex → search database → manufacturer name\n\nVirtual MACs: VirtualBox (08:00:27), VMware (00:50:56, 00:0C:29), Xen (00:16:3E)

Who Uses This Tool?

• Network administrators identifying unknown devices on a LAN by MAC OUI
• Security analysts investigating network logs for rogue or suspicious devices
• IT support identifying device types from MAC addresses in DHCP logs
• IoT deployments: cataloging devices by manufacturer from MAC addresses
• Digital forensics: identifying hardware from network capture files

Pro Tips

• MAC OUI tells you the network chip manufacturer, which often (not always) equals the device manufacturer. An HP laptop with an Intel Wi-Fi card will show Intel as the OUI
• Virtual machines use OUIs from the virtualization platform (VMware, VirtualBox, Hyper-V). This is an easy way to identify VMs on your network
• Privacy: modern phones randomize MAC addresses when scanning for Wi-Fi (iOS, Android 10+, Windows 10+). These randomized MACs don't correspond to any manufacturer database
• The OUI database is publicly available from IEEE (standards-oui.ieee.org). Our tool caches a local copy for instant lookups

Frequently Asked Questions about Mac Address Lookup

Can I identify the exact device from a MAC address?

Only the manufacturer, not the model. The last 24 bits uniquely identify the device within that manufacturer but don't encode model information. You can see it's 'an Apple device' but not 'an iPhone 15 Pro.'

Does MAC address randomization affect lookup?

Yes — randomized MACs (used for Wi-Fi scanning privacy) don't map to any manufacturer. iOS/Android now use random MACs by default when scanning. Connected devices still use the real hardware MAC.

Free online Mac Address Lookup — no signup, 100% client-side processing. All data stays in your browser.