Which company owns MAC address prefix 30:31:7D?

MAC address prefix 30:31:7D is registered to Hosiden Corporation in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 30:31:7D has a network interface built by Hosiden Corporation.

What is the OUI 30:31:7D?

30:31:7D is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Hosiden Corporation. It covers every address from 30:31:7D:00:00:00 to 30:31:7D:FF:FF:FF, or 16,777,216 addresses in total. It is also written 30-31-7D.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 30:31:7D:00:00:00 that is 30:31:7D — 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 Hosiden Corporation located?

Hosiden Corporation is listed at 4-33, Kitakyuhoji 1-chome Yao Osaka JP 5810071 in the IEEE OUI registry entry for 30:31:7D. This is the address the organization registered with the IEEE, which may differ from its current operating address.

How many MAC prefixes does Hosiden Corporation own?

Hosiden Corporation holds 3 OUI prefixes in the IEEE registry, of which 30:31:7D is one. A device made by Hosiden Corporation could carry a MAC address from any of them.

Hosiden Corporation

MAC address prefix 30:31:7D is registered to Hosiden Corporation in the IEEE OUI registry. Any device whose MAC address begins with 30:31:7D has a network interface built by Hosiden Corporation. 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 30:31:7D:00:00:00 to 30:31:7D:FF:FF:FF.

OUI prefix: 30:31:7D
Hyphen form: 30-31-7D
MAC range: 30:31:7D:00:00:00 – 30:31:7D:FF:FF:FF
Addresses in block: 16,777,216
Organization: Hosiden Corporation
Address: 4-33, Kitakyuhoji 1-chome Yao Osaka JP 5810071
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 Hosiden Corporation

Hosiden Corporation holds 3 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.

2019-07-04Assigned to "Hosiden Corporation"
archived source →
2026-07-17Assigned to "Hosiden Corporation"

Nearby in the registry

The prefixes assigned immediately before and after 30:31:7D:

FAQ

Which company owns MAC address prefix 30:31:7D?: MAC address prefix 30:31:7D is registered to Hosiden Corporation in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 30:31:7D has a network interface built by Hosiden Corporation.
What is the OUI 30:31:7D?: 30:31:7D is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Hosiden Corporation. It covers every address from 30:31:7D:00:00:00 to 30:31:7D:FF:FF:FF, or 16,777,216 addresses in total. It is also written 30-31-7D.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 30:31:7D:00:00:00 that is 30:31:7D — 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 Hosiden Corporation located?: Hosiden Corporation is listed at 4-33, Kitakyuhoji 1-chome Yao Osaka JP 5810071 in the IEEE OUI registry entry for 30:31:7D. This is the address the organization registered with the IEEE, which may differ from its current operating address.
How many MAC prefixes does Hosiden Corporation own?: Hosiden Corporation holds 3 OUI prefixes in the IEEE registry, of which 30:31:7D is one. A device made by Hosiden Corporation could carry a MAC address from any of them.