Developer & Coding Tools

100% Client-Side • 100% offline privacy. MAC address lookups are verified against an internal database in browser memory with zero network queries.

MAC Address Lookup & OUI Vendor Inspector

Identify NIC hardware manufacturers from IEEE OUIs, format MAC addresses across Unix/Windows/Cisco, and generate IPv6 modified EUI-64 link-local addresses

IEEE 802 Standards & OUI Hardware Lookup

MAC Address Lookup & OUI Vendor Inspector

Identify NIC manufacturers, validate MAC address formats (Unix, Windows, Cisco), inspect Unicast/Multicast bits, and generate IPv6 modified EUI-64 link-local addresses 100% in-browser.

NIC Hardware Manufacturer

Raspberry Pi Foundation

United Kingdom

OUI Identifier

B8:27:EB

First 24-bits (3 octets)

Transmission Scope

Unicast

Globally Unique (UAA)

Validity

Valid 48-bit

12 / 12 Hex Characters

MAC Address Input

Enter MAC Address or OUI Prefix

Supports any delimiter (: - . or none). Automatically sanitizes hex characters.

Network Standard Notations

Linux / Unix / macOS:B8:27:EB:3F:8A:21

Windows OS (Hyphen):B8-27-EB-3F-8A-21

Cisco Systems (Dot):b827.eb3f.8a21

Bare Hexadecimal:B827EB3F8A21

Hardware & Protocol Details

Vendor / ManufacturerRaspberry Pi Foundation

Country of JurisdictionUnited Kingdom

Hardware CategorySingle Board Computers (Pi 1/2/3)

Individual/Group (I/G) Bit0 (Unicast)

Universal/Local (U/L) Bit0 (Globally Unique OUI)

IPv6 Modified EUI-64 Link-Local Address:

fe80::ba27:ebff:fe3f:8a21

IEEE 802 Architecture

Every Ethernet and Wi-Fi interface has a 48-bit (6-octet) MAC address. The first 3 octets (24 bits) form the OUI (Organizationally Unique Identifier) assigned by the IEEE Registration Authority to network equipment vendors, while the remaining 24 bits are assigned by the manufacturer.

Understanding MAC Addresses and Network Identification

What is an OUI (Organizationally Unique Identifier)?

An OUI is a 24-bit number assigned by the IEEE to uniquely identify a hardware manufacturer or vendor (such as Apple, Cisco, Intel, or Samsung) in network communication.

What is a Randomized / Private MAC address?

Modern operating systems (iOS, Android, Windows 11) generate randomized MAC addresses when connecting to Wi-Fi networks to prevent tracking across public hotspots. These addresses have their 7th bit (Locally Administered Address) set to 1.

How is the IPv6 EUI-64 address constructed?

EUI-64 splits the 48-bit MAC address into two 24-bit halves, inserts FF:FE in between to create a 64-bit interface identifier, and inverts the universal/local bit of the first octet.

Is my MAC query tracked?

No. Unlike external lookup APIs, NEOKYRU evaluates MAC prefixes against an internal offline database directly in your browser memory with zero network calls.

About MAC Address Lookup & OUI Vendor Inspector

Comprehensive network engineering tool for network engineers, sysadmins, and cybersecurity analysts. Identifies hardware manufacturers from IEEE Organizationally Unique Identifier (OUI) prefixes (Apple, Cisco, Intel, Samsung, Raspberry Pi, etc.), formats across colon, hyphen, dot, and bare hex conventions, analyzes Unicast/Multicast (I/G) and Universally/Locally Administered (U/L) bits, and generates modified EUI-64 IPv6 link-local addresses with an offline database. 100% private.

Key Capabilities & Features

Offline IEEE OUI database matching for leading network vendors (Apple, Cisco, Intel, etc.)
Multi-format converter (Unix colons, Windows hyphens, Cisco dots, bare hex)
Bitwise transmission analysis (Unicast vs Multicast and UAA vs LAA)
IPv6 modified EUI-64 link-local address generation
Randomized MAC generator for testing and privacy simulation
Sanitizes and cleans any formatted hex input automatically

How to Use MAC Address Lookup & OUI Vendor Inspector

Enter MAC Address

Type or paste any 12-digit MAC address or 6-digit OUI prefix.

Inspect Manufacturer

View the verified hardware vendor, country, and device type.

Copy Formats

Access your MAC address formatted for Linux, Windows, or Cisco CLI commands.

Examine EUI-64 & Bits

Review the modified EUI-64 IPv6 address and unicast/multicast bit state.

Privacy & In-Browser Execution Guarantee

100% offline privacy. MAC address lookups are verified against an internal database in browser memory with zero network queries.

Frequently Asked Questions

What is an IEEE OUI?

An Organizationally Unique Identifier (OUI) is the first 24 bits (3 octets) of a MAC address assigned by the IEEE to identify the device manufacturer.

How does EUI-64 conversion work?

EUI-64 splits the 48-bit MAC address in half, inserts FF:FE in the middle to create 64 bits, and flips the 7th universal/local bit of the first byte.

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