About

MAC Address

A MAC address (Media Access Control Address) is a unique hardware identifier assigned to a network interface at the data link layer, used to identify devices within a local area network.

A standard MAC address is 48 bits long, written as 12 hexadecimal digits:

40:6c:8f:18:2c:03   10-40-F3-AB-4E-C8

The first 3 bytes are the OUI (Organizationally Unique Identifier), assigned to manufacturers by IEEE. The last 3 bytes are assigned by the manufacturer.

About This Site

This site periodically fetches the latest IEEE OUI records from the Wireshark official data source (every 30 days), providing MAC address vendor lookup services.

• Supports standard OUI (24-bit) and extended prefixes (28/36-bit)
• Data source: Wireshark manuf database, 57,000+ records
• Backend: Rust + Axum, prefix-trie index, response <10ms

JSON API

GET /api/mac2vendor?mac=<MAC address>

curl "https://7n4.cn/api/mac2vendor?mac=40:6c:8f:18:2c:03"

{
  "mac": "40:6c:8f:18:2c:03",
  "manuf": "Apple",
  "comment": "Apple, Inc."
}

Returns HTTP 404 when not found: {"error": "vendor not found for MAC ..."}