MAC Address OUI & Vendor Lookup
Search MAC addresses to identify hardware manufacturers (MikroTik, Ubiquiti, Huawei, Cisco, Nokia) and decode OUI prefix bits.
Identifying Network Device Manufacturers via MAC OUI
A MAC (Media Access Control) address is a 48-bit unique identifier. The first 24 bits (3 octets) represent the Organizationally Unique Identifier (OUI) assigned by IEEE.
Instantly decoding MAC OUIs helps NOC engineers identify unauthorized routers, pinpoint rogue CPE switches, and verify subscriber ONT hardware vendor types.
Interactive MAC Address OUI & Vendor Lookup Workspace
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MAC Address Lookup
Find the hardware vendor behind any MAC address and decode the OUI bits.
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MAC Address Lookup
Real-World Calculation Walkthrough
Inspecting a connected subscriber MAC address: 00:0C:42:A1:B2:C3
Input Parameters
Calculation Output
MAC Address OUI & Vendor Lookup Engineering FAQs
What is an OUI in a MAC address?
An Organizationally Unique Identifier (OUI) is a 24-bit number assigned by IEEE to hardware manufacturers to ensure globally unique device MACs.
How do randomized MAC addresses on iOS/Android affect ISP authentication?
Mobile OS privacy features randomize MACs on public Wi-Fi. ISP subscriber provisioning uses PPPoE credentials or Option 82 DHCP circuit-IDs instead of MACs for billing.
What is the difference between unicast and multicast MAC addresses?
If the least significant bit of the first octet is 0, the MAC is unicast. If it is 1 (e.g., 01:00:5E), it is a multicast MAC address.
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