MAC Address Lookup - Streets Services

MAC Lookup

Enter MAC Address

Try an example:

00:1A:2B:3C:4D:5E A4-C3-F0-85-AC-C9 001B.4F2A.9D3C B8:27:EB:12:34:56 00:50:56:AB:CD:EF

Results

Unknown Vendor

OUI: —

Normalised (Colon)—

Hyphen Format—

Cisco Format—

No Separator—

Type—

Multicast?—

Locally Administered?—

Binary (OUI)—

About MAC Addresses

🔢 Structure

A MAC address is 48 bits (6 bytes) long. The first 3 bytes form the OUI (Organisationally Unique Identifier) assigned to the manufacturer. The last 3 bytes are the device-specific identifier assigned by the vendor.

📝 Common Formats

MAC addresses appear in several formats: colon-separated (00:1A:2B:3C:4D:5E), hyphen-separated (00-1A-2B-3C-4D-5E), Cisco dot notation (001A.2B3C.4D5E), or as a plain 12-character hex string.

🎭 Special Bits

Bit 0 of the first byte indicates multicast (1) or unicast (0). Bit 1 indicates locally administered (1) or globally unique/OUI enforced (0). Broadcast is FF:FF:FF:FF:FF:FF.

🔒 Privacy

Modern devices (iOS 14+, Android 10+, Windows 10+) use randomised MAC addresses when connecting to WiFi to prevent tracking. These have the locally administered bit set and won't match a real manufacturer OUI.