Which company owns MAC address prefix 84:D5:A0?

MAC address prefix 84:D5:A0 is registered to MCOT INC. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 84:D5:A0 has a network interface built by MCOT INC..

What is the OUI 84:D5:A0?

84:D5:A0 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to MCOT INC.. It covers every address from 84:D5:A0:00:00:00 to 84:D5:A0:FF:FF:FF, or 16,777,216 addresses in total. It is also written 84-D5-A0.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 84:D5:A0:00:00:00 that is 84:D5:A0 — 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 MCOT INC. located?

MCOT INC. is listed at Yogohigashi 1-5-12 Matsuyama Ehime JP 790-0044 in the IEEE OUI registry entry for 84:D5:A0. This is the address the organization registered with the IEEE, which may differ from its current operating address.

How many MAC prefixes does MCOT INC. own?

MCOT INC. holds 2 OUI prefixes in the IEEE registry, of which 84:D5:A0 is one. A device made by MCOT INC. could carry a MAC address from any of them.

MCOT INC.

MAC address prefix 84:D5:A0 is registered to MCOT INC. in the IEEE OUI registry. Any device whose MAC address begins with 84:D5:A0 has a network interface built by MCOT 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 84:D5:A0:00:00:00 to 84:D5:A0:FF:FF:FF.

OUI prefix: 84:D5:A0
Hyphen form: 84-D5-A0
MAC range: 84:D5:A0:00:00:00 – 84:D5:A0:FF:FF:FF
Addresses in block: 16,777,216
Organization: MCOT INC.
Address: Yogohigashi 1-5-12 Matsuyama Ehime JP 790-0044
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 MCOT INC.

MCOT INC. holds 2 OUI prefixes in total. A device with this exact prefix could just as well carry any of these:

F8:E4:4E

Assignment history (2)

The IEEE registry publishes current state only — this is the change record we've kept since we started tracking it daily.

2024-02-15Assigned to "MCOT INC."
archived source →
2026-07-17Assigned to "MCOT INC."

Nearby in the registry

The prefixes assigned immediately before and after 84:D5:A0:

FAQ

Which company owns MAC address prefix 84:D5:A0?: MAC address prefix 84:D5:A0 is registered to MCOT INC. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 84:D5:A0 has a network interface built by MCOT INC..
What is the OUI 84:D5:A0?: 84:D5:A0 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to MCOT INC.. It covers every address from 84:D5:A0:00:00:00 to 84:D5:A0:FF:FF:FF, or 16,777,216 addresses in total. It is also written 84-D5-A0.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 84:D5:A0:00:00:00 that is 84:D5:A0 — 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 MCOT INC. located?: MCOT INC. is listed at Yogohigashi 1-5-12 Matsuyama Ehime JP 790-0044 in the IEEE OUI registry entry for 84:D5:A0. This is the address the organization registered with the IEEE, which may differ from its current operating address.
How many MAC prefixes does MCOT INC. own?: MCOT INC. holds 2 OUI prefixes in the IEEE registry, of which 84:D5:A0 is one. A device made by MCOT INC. could carry a MAC address from any of them.