DevToolKit

MAC Address & Vendor Inspector

Instantly identify device manufacturers and analyze MAC address properties. Features IEEE OUI database, bit-flag detection (U/L, I/G), and batch lookup support. 100% private.

Network Utility

Vendor Inspector

Global Search

Did you know?

MAC addresses are globally unique (except for "Local" ones). The first 3 bytes (OUI) identify the manufacturer.

Enter a MAC address to view details
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How to Use

The MAC Address & Vendor Inspector is a high-performance diagnostic tool for network administrators and security professionals.

How to use this tool

  1. Enter MAC: Type or paste a MAC address (e.g., B8:27:EB:12:34:56) into the search field. The tool supports various separators like colons, dashes, or no separators at all.
  2. Analyze Manufacturer: The tool instantly queries its local OUI database to identify the hardware manufacturer (Vendor).
  3. Bit-Level Decoding: Review the Bit Flags to see if the address is Universal vs. Local, and Unicast vs. Multicast.
  4. Example Lookups: Use the quick-action buttons to see how addresses from major vendors like Apple, Cisco, and Raspberry Pi are represented.
  5. Local Privacy: All lookups are performed entirely in your browser. Your internal network MAC addresses are never sent to any server.

About This Tool

Understanding MAC Addresses

A Media Access Control (MAC) address is a unique identifier assigned to a network interface controller (NIC). It consists of 48 bits, typically displayed as 12 hexadecimal digits. The first 24 bits are known as the **Organizationally Unique Identifier (OUI)**, which identifies the company that manufactured the device.

Beyond manufacturer data, MAC addresses contain internal state bits. The **U/L (Universal/Local)** bit indicates if the address was assigned by the manufacturer or by a local administrator (common in virtualization and MAC spoofing). The **I/G (Individual/Group)** bit identifies if the traffic is intended for a single recipient or a multicast group.

Why Use This Tool

Privacy-Centric Networking

MAC addresses can be used to track devices across networks. Most online lookup tools log your queries, potentially building a map of your internal infrastructure. DevToolKit's inspector uses a Local OUI Database, ensuring that your network inventory stays private and local to your machine.

FAQ

What is a MAC address and what information does it reveal?
A MAC (Media Access Control) address is a unique 48-bit identifier assigned to each network interface. The first 24 bits (OUI - Organizationally Unique Identifier) identify the device manufacturer. The last 24 bits are assigned by the manufacturer for each individual device.
What are the U/L and I/G flags?
The U/L (Universal/Local) flag indicates whether the address was assigned by the manufacturer (universal) or configured locally. The I/G (Individual/Group) flag indicates whether the address identifies a single device (unicast) or a group (multicast). These flags are in the least significant bits of the first octet.
Does it support batch lookup?
Yes. You can enter multiple MAC addresses, one per line, and the tool will identify the manufacturer of each one simultaneously. This is useful for auditing devices on a network.
Are my MAC addresses sent to a server?
The OUI database is loaded locally in your browser. The lookup is performed entirely client-side without sending MAC addresses to external servers.
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