Which company owns MAC address prefix BC:76:4E?

MAC address prefix BC:76:4E is registered to Rackspace US, Inc. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with BC:76:4E has a network interface built by Rackspace US, Inc..

What is the OUI BC:76:4E?

BC:76:4E is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Rackspace US, Inc.. It covers every address from BC:76:4E:00:00:00 to BC:76:4E:FF:FF:FF, or 16,777,216 addresses in total. It is also written BC-76-4E.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in BC:76:4E:00:00:00 that is BC:76:4E — 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 Rackspace US, Inc. located?

Rackspace US, Inc. is listed at 5000 Walzem Rd. San Antonio TX US 78218 in the IEEE OUI registry entry for BC:76:4E. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Rackspace US, Inc.

MAC address prefix BC:76:4E is registered to Rackspace US, Inc. in the IEEE OUI registry. Any device whose MAC address begins with BC:76:4E has a network interface built by Rackspace US, Inc.. 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 BC:76:4E:00:00:00 to BC:76:4E:FF:FF:FF.

OUI prefix: BC:76:4E
Hyphen form: BC-76-4E
MAC range: BC:76:4E:00:00:00 – BC:76:4E:FF:FF:FF
Addresses in block: 16,777,216
Organization: Rackspace US, Inc.
Address: 5000 Walzem Rd. San Antonio TX US 78218
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.

Assignment history (2)

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 "Rackspace US, Inc."
archived source →
2026-07-17Assigned to "Rackspace US, Inc."

Nearby in the registry

The prefixes assigned immediately before and after BC:76:4E:

FAQ

Which company owns MAC address prefix BC:76:4E?: MAC address prefix BC:76:4E is registered to Rackspace US, Inc. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with BC:76:4E has a network interface built by Rackspace US, Inc..
What is the OUI BC:76:4E?: BC:76:4E is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Rackspace US, Inc.. It covers every address from BC:76:4E:00:00:00 to BC:76:4E:FF:FF:FF, or 16,777,216 addresses in total. It is also written BC-76-4E.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in BC:76:4E:00:00:00 that is BC:76:4E — 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 Rackspace US, Inc. located?: Rackspace US, Inc. is listed at 5000 Walzem Rd. San Antonio TX US 78218 in the IEEE OUI registry entry for BC:76:4E. This is the address the organization registered with the IEEE, which may differ from its current operating address.