Which company owns MAC address prefix D0:99:D5?

MAC address prefix D0:99:D5 is registered to Alcatel-Lucent in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with D0:99:D5 has a network interface built by Alcatel-Lucent.

What is the OUI D0:99:D5?

D0:99:D5 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Alcatel-Lucent. It covers every address from D0:99:D5:00:00:00 to D0:99:D5:FF:FF:FF, or 16,777,216 addresses in total. It is also written D0-99-D5.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in D0:99:D5:00:00:00 that is D0:99:D5 — 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 Alcatel-Lucent located?

Alcatel-Lucent is listed at 777 East Middlefield Road Mountain View CA US 94043 in the IEEE OUI registry entry for D0:99:D5. This is the address the organization registered with the IEEE, which may differ from its current operating address.

How many MAC prefixes does Alcatel-Lucent own?

Alcatel-Lucent holds 8 OUI prefixes in the IEEE registry, of which D0:99:D5 is one. A device made by Alcatel-Lucent could carry a MAC address from any of them.

Alcatel-Lucent

MAC address prefix D0:99:D5 is registered to Alcatel-Lucent in the IEEE OUI registry. Any device whose MAC address begins with D0:99:D5 has a network interface built by Alcatel-Lucent. 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 D0:99:D5:00:00:00 to D0:99:D5:FF:FF:FF.

OUI prefix: D0:99:D5
Hyphen form: D0-99-D5
MAC range: D0:99:D5:00:00:00 – D0:99:D5:FF:FF:FF
Addresses in block: 16,777,216
Organization: Alcatel-Lucent
Address: 777 East Middlefield Road Mountain View CA US 94043
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 Alcatel-Lucent

Alcatel-Lucent holds 8 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.

2016-07-29Assigned to "Alcatel-Lucent"
archived source →
2026-07-17Assigned to "Alcatel-Lucent"

Nearby in the registry

The prefixes assigned immediately before and after D0:99:D5:

FAQ

Which company owns MAC address prefix D0:99:D5?: MAC address prefix D0:99:D5 is registered to Alcatel-Lucent in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with D0:99:D5 has a network interface built by Alcatel-Lucent.
What is the OUI D0:99:D5?: D0:99:D5 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Alcatel-Lucent. It covers every address from D0:99:D5:00:00:00 to D0:99:D5:FF:FF:FF, or 16,777,216 addresses in total. It is also written D0-99-D5.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in D0:99:D5:00:00:00 that is D0:99:D5 — 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 Alcatel-Lucent located?: Alcatel-Lucent is listed at 777 East Middlefield Road Mountain View CA US 94043 in the IEEE OUI registry entry for D0:99:D5. This is the address the organization registered with the IEEE, which may differ from its current operating address.
How many MAC prefixes does Alcatel-Lucent own?: Alcatel-Lucent holds 8 OUI prefixes in the IEEE registry, of which D0:99:D5 is one. A device made by Alcatel-Lucent could carry a MAC address from any of them.