MAC Address Lookup — Free OUI Lookup & MAC Vendor Lookup Online

MAC Address Lookup — Free OUI Lookup & MAC Vendor Lookup Online. Free MAC address lookup tool. Instantly find the vendor and manufacturer from any MAC address using our offline OUI database — 100% private, no data sent to servers.

Instantly perform a MAC address lookup with our free online OUI lookup tool. Enter any MAC address to identify the device manufacturer, network vendor, and Organizationally Unique Identifier (OUI) in real time.

Whether you are an IT admin auditing DHCP leases, a security engineer tracking rogue devices, or a network engineer inventorying hardware, our MAC vendor lookup tool delivers accurate OUI matches instantly — no sign-up required.

Our MAC address lookup tool runs 100% in your browser using a locally embedded OUI database. Your MAC addresses are never uploaded to a remote server, making this the most private OUI lookup tool available. Supports colon, dash, and dot-separated MAC formats.

Related tools: IPv4 Subnet Calculator, IPv4 Address Converter, MAC Address Generator.

Frequently asked questions

How do I find the vendor of a MAC address?

Type or paste the address into the MAC address field, for example 20:37:06:12:34:56. The Vendor info card instantly shows the registered manufacturer and its postal address, and Copy vendor info puts that text on your clipboard.

What is an OUI and how does the OUI lookup work?

The OUI (Organizationally Unique Identifier) is the first 3 bytes, or 6 hex digits, of a MAC address, assigned by the IEEE to a manufacturer. The tool strips separators, takes those 6 digits and looks them up in a built-in database of about 34,500 registered vendor prefixes.

Which MAC address formats are accepted?

Colons, dashes and dots are ignored for the lookup and letters can be upper or lower case, so 20:37:06:12:34:56, 20-37-06-12-34-56 and 2037.0612.3456 find the same vendor. The field's validation expects the colon or dash format, so dot notation shows a warning even though the vendor is still found.

Why does it say Unknown vendor for this address?

The first 6 hex digits are not in the OUI database. This is normal for randomized or locally administered addresses, such as the private Wi-Fi addresses used by phones (second hex digit 2, 6, A or E), for some virtual machine adapters, and for a typo in the first three bytes.

Is the MAC address sent to a server?

No. The OUI database is bundled with the page and the lookup runs in your browser, so the MAC addresses you enter are not uploaded anywhere.

How to use this online tool

MAC Address Lookup — Free OUI Lookup & MAC Vendor Lookup Online is designed for fast browser workflows when you need to format, validate, convert, decode, encode, generate, or inspect data without opening a heavy desktop app. Start with the input field or visible options, review the result, then copy or download the output for the next step.

Private processing in your browser

MAC Address Lookup — Free OUI Lookup & MAC Vendor Lookup Online keeps the normal processing step local in your browser. That is useful for code snippets, tokens, documents, configuration values, text samples, and other material that should not be sent to a remote service unless you explicitly choose to share it.

When this tool is useful

Use MAC Address Lookup — Free OUI Lookup & MAC Vendor Lookup Online for repeatable developer tasks, technical documentation, QA checks, quick conversions, debugging, content cleanup, and internal team workflows. The page focuses on clear inputs, immediate feedback, and output that is easy to reuse in code, reports, tickets, emails, or notes.

Practical tips

Before copying the final result, check important details such as spacing, casing, filenames, encoding, token structure, line breaks, or output format. Small checks prevent mistakes when the result is reused in source code, API requests, documentation, spreadsheets, or shared files.