Which company owns MAC address prefix 00:00:6B?

MAC address prefix 00:00:6B is registered to Silicon Graphics in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 00:00:6B has a network interface built by Silicon Graphics.

What is the OUI 00:00:6B?

00:00:6B is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Silicon Graphics. It covers every address from 00:00:6B:00:00:00 to 00:00:6B:FF:FF:FF, or 16,777,216 addresses in total. It is also written 00-00-6B.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 00:00:6B:00:00:00 that is 00:00:6B — and look that prefix up in the IEEE OUI registry. If the second-lowest bit of the first octet is set, the address is locally administered (a randomized or private MAC), which belongs to no manufacturer and will not resolve; modern phones and laptops use these by default on each network.

Where is Silicon Graphics located?

Silicon Graphics is listed at 2011 NORTH SHORELINE BLVD. MOUNTAIN VIEW CA US 94039-7311 in the IEEE OUI registry entry for 00:00:6B. This is the address the organization registered with the IEEE, which may differ from its current operating address.

How many MAC prefixes does Silicon Graphics own?

Silicon Graphics holds 2 OUI prefixes in the IEEE registry, of which 00:00:6B is one. A device made by Silicon Graphics could carry a MAC address from any of them.

Silicon Graphics

MAC address prefix 00:00:6B is registered to Silicon Graphics in the IEEE OUI registry. Any device whose MAC address begins with 00:00:6B has a network interface built by Silicon Graphics. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address — it covers every MAC from 00:00:6B:00:00:00 to 00:00:6B:FF:FF:FF.

OUI prefix: 00:00:6B
Hyphen form: 00-00-6B
MAC range: 00:00:6B:00:00:00 – 00:00:6B:FF:FF:FF
Addresses in block: 16,777,216
Organization: Silicon Graphics
Address: 2011 NORTH SHORELINE BLVD. MOUNTAIN VIEW CA US 94039-7311
Source: IEEE OUI registry

Have a full MAC address? Look it up— we'll also tell you if it's a randomized (private) address rather than a real manufacturer prefix.

Other prefixes from Silicon Graphics

Silicon Graphics holds 2 OUI prefixes in total. A device with this exact prefix could just as well carry any of these:

08:00:69

Assignment history (3)

The IEEE registry publishes current state only — this is the change record we've kept since we started tracking it daily.

2016-07-29Assigned to "SILICON GRAPHICS INC./MIPS"
archived source →
2019-07-04Renamed from "SILICON GRAPHICS INC./MIPS" to "Silicon Graphics"
archived source →
2026-07-17Assigned to "Silicon Graphics"

Nearby in the registry

The prefixes assigned immediately before and after 00:00:6B:

FAQ

Which company owns MAC address prefix 00:00:6B?: MAC address prefix 00:00:6B is registered to Silicon Graphics in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 00:00:6B has a network interface built by Silicon Graphics.
What is the OUI 00:00:6B?: 00:00:6B is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Silicon Graphics. It covers every address from 00:00:6B:00:00:00 to 00:00:6B:FF:FF:FF, or 16,777,216 addresses in total. It is also written 00-00-6B.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 00:00:6B:00:00:00 that is 00:00:6B — and look that prefix up in the IEEE OUI registry. If the second-lowest bit of the first octet is set, the address is locally administered (a randomized or private MAC), which belongs to no manufacturer and will not resolve; modern phones and laptops use these by default on each network.
Where is Silicon Graphics located?: Silicon Graphics is listed at 2011 NORTH SHORELINE BLVD. MOUNTAIN VIEW CA US 94039-7311 in the IEEE OUI registry entry for 00:00:6B. This is the address the organization registered with the IEEE, which may differ from its current operating address.
How many MAC prefixes does Silicon Graphics own?: Silicon Graphics holds 2 OUI prefixes in the IEEE registry, of which 00:00:6B is one. A device made by Silicon Graphics could carry a MAC address from any of them.