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MAC Address Lookup

Free tool to identify the manufacturer of any network device by its MAC address. Search the complete IEEE OUI database by MAC prefix or vendor name — supports all major formats.

MAC formats: 00:1A:2B 00-1A-2B 001A2B 001A.2B3C 00.1A.2B
Vendor search: Type a company name like “Cisco” or “Apple” to find all their MAC prefixes
Database Statistics
Live Overview
33,278
Total Vendors
57,117
Total MAC Addresses
22 Mar 2026
Last Updated
265
Total Visits
MA-L
39,084 68.4%
MA-M
6,312 11.1%
MA-S
6,935 12.1%
CID
211 0.4%
IAB
4,575 8%
Download Complete Database — Get the full IEEE vendor list in CSV, JSON or XML. Always the latest data.
Recently Updated
# MAC Prefix Vendor Name Block Address
1 8C:1F:64:03:7 ENLESS WIRELESS MA-S 45 TER AVENUE DE VERDUN BRUGES FR 33520
What Does It Do?

This MAC Address Lookup tool helps you identify vendor information from any MAC address or Organizationally Unique Identifier (OUI). Enter a MAC address or vendor name to get detailed manufacturer information instantly from the official IEEE database.

  • IEEE SourceOfficial IEEE database — highest accuracy vendor identification.
  • All FormatsSupports AA:BB:CC, AA-BB-CC, AABBCC, AA.BB.CC.DD and more.
  • All BlocksCovers MA-L (OUI), MA-M, MA-S, CID and IAB assignments.

Key Features

  • Universal Format Support: Any MAC format accepted and auto-normalized.
  • Vendor Name Search: Find all MAC prefixes for a company e.g. "Cisco", "Apple".
  • Block Type Details: Precise identification across all IEEE block types.
  • Daily Database Updates: We refresh the IEEE OUI database every day — you always get the latest vendor registrations.
  • Downloadable Database: CSV, JSON and XML on the Download page.
What Is a MAC Address?

A MAC (Media Access Control) address is a unique 48-bit hardware identifier permanently assigned to a network interface controller (NIC) by the manufacturer. Every device that connects to a network — whether via Ethernet, Wi-Fi, Bluetooth, or any other interface — has at least one MAC address burned into its hardware. Unlike IP addresses, which can change dynamically, a MAC address is fixed at the hardware level and operates at OSI Layer 2 (the Data Link layer).

MAC Address Structure

  • Total length: 48 bits — 6 bytes — 12 hexadecimal digits
  • Common notation: 00:1A:2B:3C:4D:5E or 00-1A-2B-3C-4D-5E
  • First 3 bytes (OUI): Organizationally Unique Identifier — identifies the manufacturer. Assigned by IEEE.
  • Last 3 bytes (NIC-specific): Assigned by the manufacturer to uniquely identify each device.
  • Bit 0 of first byte: If set to 1, it is a multicast address; if 0, it is unicast.
  • Bit 1 of first byte: If set to 1, it is a locally administered address; if 0, it is globally unique (OUI enforced).

Common MAC Address Formats

  • 00:1A:2B:3C:4D:5E — Colon-separated (most common, used in Linux/Mac)
  • 00-1A-2B-3C-4D-5E — Hyphen-separated (used in Windows)
  • 001A2B3C4D5E — No separator (used in some databases and tools)
  • 001A.2B3C.4D5E — Cisco dot notation
  • 00.1A.2B.3C.4D.5E — Dot-per-byte notation

This tool accepts all of the above formats automatically.

IEEE Block Types (MA-L, MA-M, MA-S, CID, IAB)

  • MA-L (MAC Address Block Large) — 24-bit OUI prefix, ~16.8 million addresses per block. The classic OUI used by large manufacturers like Cisco, Apple, Samsung. Example: 00-00-0C → Cisco Systems.
  • MA-M (MAC Address Block Medium) — 28-bit prefix, ~1 million addresses per block. Used by mid-size manufacturers who do not need a full MA-L block.
  • MA-S (MAC Address Block Small) — 36-bit prefix, 4,096 addresses per block. Ideal for small vendors and IoT device manufacturers. Replaced the older OUI-36 standard.
  • CID (Company ID) — A 24-bit company identifier that is not globally unique for MAC addresses. Used in specific protocol contexts such as IEEE 802.1 and is not intended for general Ethernet address assignment.
  • IAB (Individual Address Block) — Legacy block type, inactive since 2014. Provided 4,096 addresses using special IEEE-owned OUIs. Superseded by MA-S. Existing IAB assignments remain valid and are included in this database.
MAC Address Lookup in IT Troubleshooting

MAC address lookups are an essential part of day-to-day network administration and security work. Knowing the vendor behind a MAC address can instantly tell you what type of device is connected to your network, help you identify rogue or unauthorized hardware, and speed up fault diagnosis.

Common IT Use Cases

  • Unknown device on network: When a new device appears in your DHCP lease table or ARP cache, look up its MAC to confirm whether it belongs to a legitimate vendor (e.g., a Raspberry Pi, a Cisco switch, or an employee's phone) or a suspicious unknown manufacturer.
  • Network security audits: During a security review, cross-referencing all MAC addresses on a segment against the OUI database helps identify unrecognized or potentially rogue devices before they become a threat.
  • BYOD policy enforcement: IT teams use MAC lookups to distinguish between company-issued hardware and personal devices attempting to connect to corporate infrastructure.
  • Wireless troubleshooting: On busy Wi-Fi networks, MAC lookups help identify client device manufacturers to diagnose driver or compatibility issues specific to certain hardware vendors.
  • IoT device management: With the explosion of IoT devices, quickly identifying the manufacturer of a device via its MAC prefix helps network teams determine firmware update requirements, security patch status, and risk posture.
  • Forensics and incident response: During a security incident, MAC addresses captured in logs or packet captures can be resolved to manufacturers, helping investigators reconstruct what hardware was present and active on the network.

How to Find a MAC Address on Your Device

  • Windows: Open Command Prompt → type ipconfig /all → look for "Physical Address".
  • macOS: System Settings → Network → select interface → Details → Hardware tab.
  • Linux: Run ip link show or ifconfig in a terminal.
  • Android: Settings → About phone → Status → Wi-Fi MAC address.
  • iOS: Settings → General → About → Wi-Fi Address.
  • Network switch/router: Use show mac address-table (Cisco) or check the ARP table.
Frequently Asked Questions
What is a MAC address lookup?
A MAC address lookup identifies the manufacturer of a network device using its OUI (Organizationally Unique Identifier) prefix. The first 6 characters of any MAC address are registered to a specific company in the official IEEE database. Our tool searches this database instantly and for free.
What MAC address formats are supported?
All common formats are accepted automatically: colon-separated (00:1A:2B:3C:4D:5E), hyphen-separated (00-1A-2B-3C-4D-5E), plain hex (001A2B3C4D5E), Cisco dot notation (001A.2B3C.4D5E), and dot-per-byte (00.1A.2B.3C.4D.5E). You can also search using just the first 3 bytes (OUI prefix only).
Can I search by company or vendor name?
Yes. Simply type a company name such as “Cisco”, “Apple”, “Samsung” or “Raspberry Pi” into the search box. The tool returns all MAC address prefixes registered to that organisation in the IEEE OUI database.
How accurate is the data?
All data is sourced directly from the official IEEE Standards OUI Registry — the authoritative global database for MAC address assignments. We update our database daily to capture new registrations and changes. For legally binding information, always refer to IEEE directly.
How often is the database updated?
We refresh the complete IEEE OUI database every day. This includes all block types: MA-L (classic OUI), MA-M, MA-S, CID and IAB. New vendor registrations and updates from IEEE are reflected within 24 hours.
Can a MAC address lookup identify the exact device?
No. A MAC lookup identifies the manufacturer who registered the OUI prefix — not the specific device model. Additionally, MAC addresses can be spoofed (changed) by software on most modern devices, so results should be used as a diagnostic aid alongside other network tools, not as definitive device identification.
What are MA-L, MA-M, MA-S, CID and IAB?
These are the IEEE block types for MAC address assignments. MA-L (Large) is the classic 24-bit OUI for large manufacturers like Cisco and Apple. MA-M (Medium) uses 28-bit prefixes for mid-size companies. MA-S (Small) uses 36-bit prefixes for small vendors and IoT device makers. CID is a company identifier used for non-Ethernet protocol contexts. IAB is a legacy block type that was replaced by MA-S in 2014.
Can I download the full MAC address database?
Yes. The complete database is available as a free download in CSV, JSON and XML formats. Visit the Download page to get the latest version. Files are updated daily and include all MA-L, MA-M, MA-S, CID and IAB entries.