Which company owns MAC address prefix D4:5B:51?

MAC address prefix D4:5B:51 is registered to Motorola Mobility LLC, a Lenovo Company in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with D4:5B:51 has a network interface built by Motorola Mobility LLC, a Lenovo Company.

What is the OUI D4:5B:51?

D4:5B:51 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Motorola Mobility LLC, a Lenovo Company. It covers every address from D4:5B:51:00:00:00 to D4:5B:51:FF:FF:FF, or 16,777,216 addresses in total. It is also written D4-5B-51.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in D4:5B:51:00:00:00 that is D4:5B:51 — 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 Motorola Mobility LLC, a Lenovo Company located?

Motorola Mobility LLC, a Lenovo Company is listed at 222 West Merchandise Mart Plaza Chicago IL US 60654 in the IEEE OUI registry entry for D4:5B:51. This is the address the organization registered with the IEEE, which may differ from its current operating address.

How many MAC prefixes does Motorola Mobility LLC, a Lenovo Company own?

Motorola Mobility LLC, a Lenovo Company holds 128 OUI prefixes in the IEEE registry, of which D4:5B:51 is one. A device made by Motorola Mobility LLC, a Lenovo Company could carry a MAC address from any of them.

Motorola Mobility LLC, a Lenovo Company

MAC address prefix D4:5B:51 is registered to Motorola Mobility LLC, a Lenovo Company in the IEEE OUI registry. Any device whose MAC address begins with D4:5B:51 has a network interface built by Motorola Mobility LLC, a Lenovo Company. 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 D4:5B:51:00:00:00 to D4:5B:51:FF:FF:FF.

OUI prefix: D4:5B:51
Hyphen form: D4-5B-51
MAC range: D4:5B:51:00:00:00 – D4:5B:51:FF:FF:FF
Addresses in block: 16,777,216
Organization: Motorola Mobility LLC, a Lenovo Company
Address: 222 West Merchandise Mart Plaza Chicago IL US 60654
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 Motorola Mobility LLC, a Lenovo Company

Motorola Mobility LLC, a Lenovo Company holds 128 OUI prefixes in total. A device with this exact prefix could just as well carry any of these:

Assignment history (2)

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

2025-02-27Assigned to "Motorola Mobility LLC, a Lenovo Company"
archived source →
2026-07-17Assigned to "Motorola Mobility LLC, a Lenovo Company"

Nearby in the registry

The prefixes assigned immediately before and after D4:5B:51:

FAQ

Which company owns MAC address prefix D4:5B:51?: MAC address prefix D4:5B:51 is registered to Motorola Mobility LLC, a Lenovo Company in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with D4:5B:51 has a network interface built by Motorola Mobility LLC, a Lenovo Company.
What is the OUI D4:5B:51?: D4:5B:51 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Motorola Mobility LLC, a Lenovo Company. It covers every address from D4:5B:51:00:00:00 to D4:5B:51:FF:FF:FF, or 16,777,216 addresses in total. It is also written D4-5B-51.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in D4:5B:51:00:00:00 that is D4:5B:51 — 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 Motorola Mobility LLC, a Lenovo Company located?: Motorola Mobility LLC, a Lenovo Company is listed at 222 West Merchandise Mart Plaza Chicago IL US 60654 in the IEEE OUI registry entry for D4:5B:51. This is the address the organization registered with the IEEE, which may differ from its current operating address.
How many MAC prefixes does Motorola Mobility LLC, a Lenovo Company own?: Motorola Mobility LLC, a Lenovo Company holds 128 OUI prefixes in the IEEE registry, of which D4:5B:51 is one. A device made by Motorola Mobility LLC, a Lenovo Company could carry a MAC address from any of them.