MAC Address Lookup

Look up the vendor or manufacturer for any MAC address using the IEEE OUI database. Supports colon, dash, and dot-separated formats.

DevForge is free and ad-supported. Buy me a coffee if it saved you time.

How to Use This Tool

Enter a MAC address in any common format (AA:BB:CC:DD:EE:FF, AA-BB-CC-DD-EE-FF, or AABB.CCDD.EEFF) and click Look Up. The vendor name is fetched from the IEEE OUI database via the macvendors.com API.

Common Use Cases

  • Identify unknown devices on your network by their MAC address
  • Verify the manufacturer of a network interface card
  • Investigate suspicious ARP entries or DHCP leases
  • Network forensics and inventory auditing

Frequently Asked Questions

What is an OUI?

OUI stands for Organizationally Unique Identifier. It is the first 24 bits (6 hex digits) of a MAC address and is assigned by the IEEE to manufacturers. It identifies which company made the network interface.

What MAC address formats are accepted?

This tool accepts MAC addresses in the most common formats: colon-separated (AA:BB:CC:DD:EE:FF), dash-separated (AA-BB-CC-DD-EE-FF), and dot-separated (AABB.CCDD.EEFF). The lookup uses only the first 6 hex digits (OUI prefix).

What data source is used?

Vendor information is fetched from the macvendors.com API, which is based on the IEEE OUI database. An internet connection is required.

Why might a lookup return 'Unknown'?

Some OUI prefixes are not in the public IEEE database — this is common for private, locally administered, or recently assigned addresses.