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Layer 2

MAC Toolkit

Paste a MAC in any format and get all its notations, the OUI and NIC, the I/G and U/L bits explained, the EUI-64 and the IPv6 link-local address. Nothing is sent to any server.

Accepts :, -, Cisco (.) or no separators. That's 12 hex digits (48 bits).

Examples

Generates a locally administered unicast MAC (I/G=0, U/L=1).

redzilla.cl — mac 
 
 
 
 Colon —  
 
 Cisco —  
 
 EUI-64 —  
 
 Link-local —  
 
  
 
 
I/G bit (unicast / group)
 
—
 
—
 
 
 
U/L bit (universal / local)
 
—
 
—
 
 
  
 
Notations
 
 
  
FormatUPPERCASElowercase
   
 
 
 

The manufacturer name (OUI) is not resolved locally: this toolkit does not include
        a vendor database and does not query any external service.

 
 How the EUI-64 and link-local are derived 
 
 1. The U/L bit (second least significant bit) of the
            first octet of the MAC is flipped.

 
 2. The bytes FF FE are inserted between
            the OUI (3 bytes) and the NIC (3 bytes), forming a 64-bit identifier.

 
 3. That interface identifier is prepended with the
            link-local prefix fe80::/64 to obtain the IPv6 address.

 
 
 
 
 
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