Which company owns MAC address prefix 00:E0:4D?

MAC address prefix 00:E0:4D is registered to INTERNET INITIATIVE JAPAN, INC in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 00:E0:4D has a network interface built by INTERNET INITIATIVE JAPAN, INC.

What is the OUI 00:E0:4D?

00:E0:4D is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to INTERNET INITIATIVE JAPAN, INC. It covers every address from 00:E0:4D:00:00:00 to 00:E0:4D:FF:FF:FF, or 16,777,216 addresses in total. It is also written 00-E0-4D.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 00:E0:4D:00:00:00 that is 00:E0:4D — 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 INTERNET INITIATIVE JAPAN, INC located?

INTERNET INITIATIVE JAPAN, INC is listed at Iidabashi Grand Bloom 2-10-2 Fujimi Tokyo Chiyoda-ku JP 102-0071 in the IEEE OUI registry entry for 00:E0:4D. This is the address the organization registered with the IEEE, which may differ from its current operating address.

INTERNET INITIATIVE JAPAN, INC

MAC address prefix 00:E0:4D is registered to INTERNET INITIATIVE JAPAN, INC in the IEEE OUI registry. Any device whose MAC address begins with 00:E0:4D has a network interface built by INTERNET INITIATIVE JAPAN, 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 00:E0:4D:00:00:00 to 00:E0:4D:FF:FF:FF.

OUI prefix: 00:E0:4D
Hyphen form: 00-E0-4D
MAC range: 00:E0:4D:00:00:00 – 00:E0:4D:FF:FF:FF
Addresses in block: 16,777,216
Organization: INTERNET INITIATIVE JAPAN, INC
Address: Iidabashi Grand Bloom 2-10-2 Fujimi Tokyo Chiyoda-ku JP 102-0071
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 "INTERNET INITIATIVE JAPAN, INC"
archived source →
2026-07-17Assigned to "INTERNET INITIATIVE JAPAN, INC"

Nearby in the registry

The prefixes assigned immediately before and after 00:E0:4D:

FAQ

Which company owns MAC address prefix 00:E0:4D?: MAC address prefix 00:E0:4D is registered to INTERNET INITIATIVE JAPAN, INC in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 00:E0:4D has a network interface built by INTERNET INITIATIVE JAPAN, INC.
What is the OUI 00:E0:4D?: 00:E0:4D is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to INTERNET INITIATIVE JAPAN, INC. It covers every address from 00:E0:4D:00:00:00 to 00:E0:4D:FF:FF:FF, or 16,777,216 addresses in total. It is also written 00-E0-4D.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 00:E0:4D:00:00:00 that is 00:E0:4D — 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 INTERNET INITIATIVE JAPAN, INC located?: INTERNET INITIATIVE JAPAN, INC is listed at Iidabashi Grand Bloom 2-10-2 Fujimi Tokyo Chiyoda-ku JP 102-0071 in the IEEE OUI registry entry for 00:E0:4D. This is the address the organization registered with the IEEE, which may differ from its current operating address.