MAC Address Lookup

Find vendor information by MAC address or Vendor Name

What Does It Do?

This MAC Address Lookup tool helps you identify vendor information from any MAC address or Organizationally Unique Identifier (OUI). Simply enter a MAC address or vendor name to get detailed information about the manufacturer. Learn more about MAC addresses in our Complete MAC Address Guide.

  • IEEE Source We utilize the official IEEE database to ensure the highest accuracy for vendor identification.
  • Daily Updates Our database is updated every 24 hours to include the latest hardware vendors and prefixes.

Key Features:

  • Universal Format Support: Search by MAC address in any format (00:1A:2B:3C:4D:5E, 00-1A-2B-3C-4D-5E, 001A2B3C4D5E, 001A.2B3C.4D5E, 00.1A.2B.3C.4D.5E).
  • Vendor Search: Find all MAC prefixes associated with a specific company (e.g., "Cisco", "Apple").
  • Block Type Details: View specific block sizes (MA-L, MA-M, MA-S, IAB, CID) for precise identification.

Database Statistics

Live Overview

What Is a MAC Address?

A MAC (Media Access Control) address is a unique 48-bit hardware identifier assigned to network interfaces (NICs, Wi-Fi cards, Bluetooth, etc.). It operates at Layer 2 and is primarily used for communication within the same local network (LAN / broadcast domain).

MAC Address Structure

  • 48 bits (6 bytes / 12 hexadecimal digits)
  • Usually written in hexadecimal with separators: 00:1A:2B:3C:4D:5E or 00-1A-2B-3C-4D-5E
  • First 24 bits → Organizationally Unique Identifier (OUI) — identifies the manufacturer
  • Last 24 bits → Device-specific portion (assigned by the manufacturer)
  • Officially managed and assigned by the IEEE Registration Authority

The first three bytes (OUI) identify the vendor. Large organizations purchase their own OUI(s), while smaller ones use blocks from IEEE's smaller allocation types.

MAC Address Block Types (IEEE Allocations)

IEEE assigns MAC address blocks in different sizes depending on an organization's needs. These are called MAC Address Block types (MA-L, MA-M, MA-S).

Current Main Block Types

  • MA-L (MAC Address Block Large)
    • Prefix: 24 bits (classic OUI)
    • ~16.8 million addresses (2²⁴)
    • Also includes large EUI-64 space
    • Example: 00-00-0C → Cisco Systems, Inc.
  • MA-M (MAC Address Block Medium)
    • Prefix: 28 bits
    • ~1 million addresses (2²⁰)
    • Also includes EUI-64 space
    • Example: C8-5C-E2-7 → SYNERGY SYSTEMS AND SOLUTIONS
  • MA-S (MAC Address Block Small)
    • Prefix: 36 bits (previously called OUI-36)
    • 4,096 addresses (2¹²)
    • Also includes EUI-64 space
    • Most common for small vendors & IoT devices today
    • Example: 70-B3-D5-9F3 → various small vendors

Legacy / Special Types

  • IAB (Individual Address Block) — inactive since 2014
    • Replaced by MA-S
    • 4,096 addresses (2¹²)
    • Used special OUIs owned by IEEE (e.g., 00-50-C2:xx-xx-xx or 40-D8-55:0x:xx-xx)
    • Existing IABs can still be used
  • CID (Company ID)
    • Special / rare 24-bit identifier
    • Used mainly for contexts other than standard MAC addresses (e.g., some protocol identifiers)
    • Very few assignments exist
Large companies usually get MA-L, medium-sized ones get MA-M, and small vendors / IoT manufacturers typically receive MA-S.
IAB is legacy — almost all new small allocations are now MA-S.