Which company owns MAC address prefix 64:5E:BE?

MAC address prefix 64:5E:BE is registered to Yahoo! JAPAN in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 64:5E:BE has a network interface built by Yahoo! JAPAN.

What is the OUI 64:5E:BE?

64:5E:BE is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Yahoo! JAPAN. It covers every address from 64:5E:BE:00:00:00 to 64:5E:BE:FF:FF:FF, or 16,777,216 addresses in total. It is also written 64-5E-BE.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 64:5E:BE:00:00:00 that is 64:5E:BE — 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 Yahoo! JAPAN located?

Yahoo! JAPAN is listed at Midtown Tower Minato-ku Tokyo JP 107-6211 in the IEEE OUI registry entry for 64:5E:BE. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Yahoo! JAPAN

MAC address prefix 64:5E:BE is registered to Yahoo! JAPAN in the IEEE OUI registry. Any device whose MAC address begins with 64:5E:BE has a network interface built by Yahoo! JAPAN. 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 64:5E:BE:00:00:00 to 64:5E:BE:FF:FF:FF.

OUI prefix: 64:5E:BE
Hyphen form: 64-5E-BE
MAC range: 64:5E:BE:00:00:00 – 64:5E:BE:FF:FF:FF
Addresses in block: 16,777,216
Organization: Yahoo! JAPAN
Address: Midtown Tower Minato-ku Tokyo JP 107-6211
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 "Yahoo! JAPAN"
archived source →
2026-07-17Assigned to "Yahoo! JAPAN"

Nearby in the registry

The prefixes assigned immediately before and after 64:5E:BE:

FAQ

Which company owns MAC address prefix 64:5E:BE?: MAC address prefix 64:5E:BE is registered to Yahoo! JAPAN in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 64:5E:BE has a network interface built by Yahoo! JAPAN.
What is the OUI 64:5E:BE?: 64:5E:BE is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Yahoo! JAPAN. It covers every address from 64:5E:BE:00:00:00 to 64:5E:BE:FF:FF:FF, or 16,777,216 addresses in total. It is also written 64-5E-BE.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 64:5E:BE:00:00:00 that is 64:5E:BE — 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 Yahoo! JAPAN located?: Yahoo! JAPAN is listed at Midtown Tower Minato-ku Tokyo JP 107-6211 in the IEEE OUI registry entry for 64:5E:BE. This is the address the organization registered with the IEEE, which may differ from its current operating address.