Which company owns MAC address prefix EC:2C:49?

MAC address prefix EC:2C:49 is registered to NakaoLab, The University of Tokyo in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with EC:2C:49 has a network interface built by NakaoLab, The University of Tokyo.

What is the OUI EC:2C:49?

EC:2C:49 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to NakaoLab, The University of Tokyo. It covers every address from EC:2C:49:00:00:00 to EC:2C:49:FF:FF:FF, or 16,777,216 addresses in total. It is also written EC-2C-49.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in EC:2C:49:00:00:00 that is EC:2C:49 — 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 NakaoLab, The University of Tokyo located?

NakaoLab, The University of Tokyo is listed at Engineering Building 3, Room 445, 7-3-1 Hongo Tokyo Bunkyoku JP 113-0033 in the IEEE OUI registry entry for EC:2C:49. This is the address the organization registered with the IEEE, which may differ from its current operating address.

NakaoLab, The University of Tokyo

MAC address prefix EC:2C:49 is registered to NakaoLab, The University of Tokyo in the IEEE OUI registry. Any device whose MAC address begins with EC:2C:49 has a network interface built by NakaoLab, The University of Tokyo. 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 EC:2C:49:00:00:00 to EC:2C:49:FF:FF:FF.

OUI prefix: EC:2C:49
Hyphen form: EC-2C-49
MAC range: EC:2C:49:00:00:00 – EC:2C:49:FF:FF:FF
Addresses in block: 16,777,216
Organization: NakaoLab, The University of Tokyo
Address: Engineering Building 3, Room 445, 7-3-1 Hongo Tokyo Bunkyoku JP 113-0033
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 (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 "University of Tokyo"
archived source →
2023-07-11Renamed from "University of Tokyo" to "NakaoLab, The University of Tokyo"
archived source →
2026-07-17Assigned to "NakaoLab, The University of Tokyo"

Nearby in the registry

The prefixes assigned immediately before and after EC:2C:49:

FAQ

Which company owns MAC address prefix EC:2C:49?: MAC address prefix EC:2C:49 is registered to NakaoLab, The University of Tokyo in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with EC:2C:49 has a network interface built by NakaoLab, The University of Tokyo.
What is the OUI EC:2C:49?: EC:2C:49 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to NakaoLab, The University of Tokyo. It covers every address from EC:2C:49:00:00:00 to EC:2C:49:FF:FF:FF, or 16,777,216 addresses in total. It is also written EC-2C-49.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in EC:2C:49:00:00:00 that is EC:2C:49 — 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 NakaoLab, The University of Tokyo located?: NakaoLab, The University of Tokyo is listed at Engineering Building 3, Room 445, 7-3-1 Hongo Tokyo Bunkyoku JP 113-0033 in the IEEE OUI registry entry for EC:2C:49. This is the address the organization registered with the IEEE, which may differ from its current operating address.