MAC address vendor lookup
Free client-side MAC address vendor lookup web utility.
MAC Address Vendor Lookup
Normalized Representations
About this tool
How to use it
- Type or paste any MAC address in standard colon, hyphen, dot, or bare hexadecimal format.
- Inspect the identified hardware manufacturer (OUI) and registered organization.
- Review bitwise address properties including Unicast vs Multicast and Universally Administered vs Randomized / Locally Administered (LAA).
- Copy normalized MAC address formats (Cisco dot, colon-delimited, hyphenated, or raw hex).
Why it matters
Network administrators, cybersecurity engineers, and IoT developers frequently need to identify unknown devices connected to a router, diagnose DHCP lease logs, or verify device authenticity without exposing network inventory to external servers.
When to use it
Use this tool when auditing connected devices on a Wi-Fi router, configuring switch port security, formatting MAC filters, or checking if a mobile device is using randomized MAC addressing.
Common questions
What is an OUI in a MAC address?
An Organizationally Unique Identifier (OUI) consists of the first 24 bits (3 octets) of a 48-bit MAC address, assigned by the IEEE Registration Authority to specifically identify the device's hardware manufacturer.
What is a Locally Administered Address (LAA)?
If the second least significant bit of the first byte is set to 1, the address is 'Locally Administered' (LAA). Modern smartphones (iOS, Android) and Windows PCs use randomized LAAs by default when connecting to Wi-Fi to preserve user privacy and prevent tracking across physical locations.
Is my network hardware data transmitted over the internet?
No. All OUI database matching, bitwise address decomposition, and format transformations happen 100% locally in your browser with zero remote requests.