MAC Address Lookup
Instantly map physical MAC addresses to their registered vendor, assignment details, and device anatomy.
Supported formats: AA:BB:CC:DD:EE:FF, AA-BB-CC-DD-EE-FF, AABBCCDDEEFF
Apple, Inc.
Address Anatomy Structure
Organizationally Unique Identifier assigned by IEEE to identify the network hardware manufacturer.
Network Interface Controller specific host adapter index allocated uniquely per device.
Generator
Format Converter
Batch Processor
Process and analyze up to 100 MAC addresses simultaneously.
Technical Overview: What is a MAC Address?
A **Media Access Control (MAC) address** is a unique physical identifier assigned to a network interface controller (NIC) by manufacturers for Layer-2 hardware operations.
Unlike temporary software-assigned IP addresses, physical MAC addresses are permanently "burned into" the network adapter chip at the factory.
Address Space Division
A MAC address consists of **48 bits** (6 octets) represented as twelve hexadecimal characters.
// Anatomy Breakdown
First 3 Bytes (OUI): 3C:07:54 (Apple, Inc.)
Last 3 Bytes (NIC): 12:34:56 (Unique Device ID)
Frequently Asked Questions
Can I change my physical MAC address?
Is my physical MAC address visible to global websites?
What is an OUI prefix?
What a MAC Address Tells You
Reading the address
A MAC address is 48 bits in six pairs — and the structure is informative:
| Part | Meaning |
|---|---|
| First 3 pairs (OUI) | The manufacturer — what this lookup resolves |
| Last 3 pairs | Device serial portion, assigned by that maker |
| Locally-administered bit set | Randomized/virtual MAC — no real vendor |
| Format variants | AA:BB:CC, AA-BB-CC, AABB.CC — same address |
The practical use: identifying mystery devices
Your router's client list shows fifteen connected devices and you recognize ten. Looking up each unknown MAC's vendor turns “unknown device” into “Xiaomi” (the forgotten smart bulb) or “Espressif” (someone's IoT board). One honest caveat: modern phones randomize their WiFi MAC per network by default, showing locally-administered addresses with no vendor — absence of a match increasingly means “recent phone”, not “intruder”.
Layer 2 vs layer 3
MAC addresses live on your local network segment only — they never cross the internet, which is why “tracking by MAC” across the web is a myth. The internet-visible identifier is the IP, examined in the IP lookup; the network ranges those IPs belong to compute in the subnet calculator; and name resolution above both layers checks out in the DNS lookup.