IEEE OUI MAC Address Vendor Lookup & Parser
Lookup hardware manufacturers (Apple, Cisco, Intel, Huawei, Samsung) from 48-bit MAC or 24-bit OUI addresses. Perform bit-level diagnostics (Unicast vs Multicast, Universal vs Private Randomized MAC), and convert between colon, hyphen, Cisco dot, integer, and IPv6 EUI-64 formats instantly.
Apple, Inc.
Standard Representation Formats
Bit-Level Flag Inspection
Ethernet standards evaluate the two least significant bits of the first byte to govern link-layer switching:
Point-to-point unicast hardware address. Switches learn this port mapping in their MAC forwarding tables (CAM table).
Universally Administered: Factory burned-in address (BIA) uniquely registered and certified with the IEEE Registration Authority.
Understanding IEEE MAC Addresses & OUI Architecture
Essential networking fundamentals for network engineers, cybersecurity analysts, and system administrators.
48-bit EUI-48 Breakdown
A Media Access Control (MAC) address is a unique 48-bit identifier assigned to Network Interface Controllers (NICs). The first 24 bits (3 octets) constitute the Organizationally Unique Identifier (OUI) managed by the IEEE. The remaining 24 bits are serialized device identifiers assigned by the manufacturer.
Private Wi-Fi MAC Randomization
iOS 14+, Android 10+, and Windows 11 use Locally Administered Addresses (LAA) to shield users from physical location tracking across Wi-Fi networks. Whenever the 2nd least significant bit of the first octet is set to 1 (hex second digit 2, 6, A, E), the MAC does not reflect the real physical device manufacturer.
Zero Server Data Retention
In strict accordance with the ToolsAA Privacy Architecture, all MAC address parsing, OUI dictionary lookups, bitmask calculations, and format transformations take place 100% inside your browser runtime. No IP addresses or hardware identifiers are ever logged or transmitted.
Frequently Asked Questions (FAQ)
How do I find the MAC address on my device?
On Windows, execute getmac /v or ipconfig /all in Command Prompt. On macOS and Linux, run ifconfig or ip link show. On iOS and Android, check Settings > General > About > Wi-Fi Address.
What is the difference between Unicast and Multicast?
Unicast addresses (I/G bit = 0) route packets to a single physical network adapter. Multicast addresses (I/G bit = 1) deliver packets simultaneously to a group of subscribed endpoints, such as mDNS (01:00:5E:00:00:FB) or IPv6 neighbor discovery.
How does IPv6 EUI-64 generation work?
IPv6 Stateless Address Autoconfiguration (SLAAC) splits the 48-bit MAC into two 24-bit halves, inserts FF:FE in the middle to create a 64-bit identifier, and inverts the universal/local bit (Bit 1) of the first byte (RFC 4291).
Why does Cisco use dot notation instead of colons?
Cisco IOS adopted dot notation (001a.2b3c.4d5e) grouping 4 hexadecimal digits with 2 periods for faster readability in command-line switch tables (e.g., show mac address-table).