CISCO Device Type by MAC Address

Answered Question
Dec 30th, 2008

Morning All,

I'm looking to find the 'device type' from the MAC Address ina packet capture.

I realise the first 3 bytes indicate the OUI, but once I know it is a CISCO device how can I work out the type of device it is i.e. 6500 catalyst, router etc.

Any pointers in the right direction would be grateful.

Thanks,

Mario

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Correct Answer by carenas123 about 8 years 2 weeks ago

A universally administered address is uniquely assigned to a device by its manufacturer; these are sometimes called "burned-in addresses" (BIA). The first three octets (in transmission order) identify the organization that issued the identifier and are known as the Organizationally Unique Identifier (OUI).The following three (MAC-48 and EUI-48) or five (EUI-64) octets are assigned by that organization in nearly any manner they please, subject to the constraint of uniqueness. The IEEE expects the MAC-48 space to be exhausted no sooner than the year 2100; EUI-64s are not expected to run out in the foreseeable future.

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Correct Answer
carenas123 Mon, 01/05/2009 - 07:15

A universally administered address is uniquely assigned to a device by its manufacturer; these are sometimes called "burned-in addresses" (BIA). The first three octets (in transmission order) identify the organization that issued the identifier and are known as the Organizationally Unique Identifier (OUI).The following three (MAC-48 and EUI-48) or five (EUI-64) octets are assigned by that organization in nearly any manner they please, subject to the constraint of uniqueness. The IEEE expects the MAC-48 space to be exhausted no sooner than the year 2100; EUI-64s are not expected to run out in the foreseeable future.

mariov652 Tue, 01/06/2009 - 01:11

Thank you for the reply.

I was aware that the first 3 octets refer to the manufacturer/organization, I was looking to find out if, knowing a device is 'CISCO' by the first 3 octents, would I be able to make a guesse at the hardware type.

From your answer it seems not.

Thanks again,

Mario

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