What's the difference between EUI-48 and MAC-48? | FAQ | MAC Address Vendor Lookup
Frequently asked questions

What's the difference between EUI-48 and MAC-48?

Historically, both EUI-48 and MAC-48 were concatenations of a 24-bit OUI (Organizationally Unique Identifier) assigned by the IEEE and a 24-bit extension identifier assigned by the organization with that OUI assignment (NIC).

The distinction between EUI-48 and MAC-48 identifiers is merely nominal: MAC-48 is used for network hardware; EUI-48 is used to identify other devices and software. (Thus, by definition, an EUI-48 is not in fact a "MAC address", although it is syntactically indistinguishable from one and assigned from the same numbering space.)

The IEEE now considers the label MAC-48 to be an obsolete term formerly used to refer to a specific type of EUI-48 identifier that addresses hardware interfaces within existing 802-based networking applications. Therefore, it is unlikely to be used in the future. Instead, the proprietary term EUI-48 should serve this purpose.

The EUI-48 is expected to have exhausted its address space by the year 2100.

Trusted by the following companies

Flex.com webafrica.co.za wework.com guarddog.ai cybercns.com

and many more...

Download an exhaustive MAC Address Vendor Database for your educational, business or enterprise needs.

Our database comes in the following forms: JSON, CSV, XML, Cisco vendorMacs.xml for maximum compatibility and fast integration into existing systems. The API version is also available.

The data was just refreshed