Which company owns MAC address prefix 64:DB:81?

MAC address prefix 64:DB:81 is registered to Syszone Co., Ltd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 64:DB:81 has a network interface built by Syszone Co., Ltd..

What is the OUI 64:DB:81?

64:DB:81 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Syszone Co., Ltd.. It covers every address from 64:DB:81:00:00:00 to 64:DB:81:FF:FF:FF, or 16,777,216 addresses in total. It is also written 64-DB-81.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 64:DB:81:00:00:00 that is 64:DB:81 — 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 Syszone Co., Ltd. located?

Syszone Co., Ltd. is listed at 9F Garak, 310 Ogeum-ro Seoul Seoul, Korea KR 138-716 in the IEEE OUI registry entry for 64:DB:81. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Syszone Co., Ltd.

MAC address prefix 64:DB:81 is registered to Syszone Co., Ltd. in the IEEE OUI registry. Any device whose MAC address begins with 64:DB:81 has a network interface built by Syszone Co., Ltd.. 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:DB:81:00:00:00 to 64:DB:81:FF:FF:FF.

OUI prefix: 64:DB:81
Hyphen form: 64-DB-81
MAC range: 64:DB:81:00:00:00 – 64:DB:81:FF:FF:FF
Addresses in block: 16,777,216
Organization: Syszone Co., Ltd.
Address: 9F Garak, 310 Ogeum-ro Seoul Seoul, Korea KR 138-716
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 "Syszone Co., Ltd."
archived source →
2026-07-17Assigned to "Syszone Co., Ltd."

Nearby in the registry

The prefixes assigned immediately before and after 64:DB:81:

FAQ

Which company owns MAC address prefix 64:DB:81?: MAC address prefix 64:DB:81 is registered to Syszone Co., Ltd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 64:DB:81 has a network interface built by Syszone Co., Ltd..
What is the OUI 64:DB:81?: 64:DB:81 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Syszone Co., Ltd.. It covers every address from 64:DB:81:00:00:00 to 64:DB:81:FF:FF:FF, or 16,777,216 addresses in total. It is also written 64-DB-81.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 64:DB:81:00:00:00 that is 64:DB:81 — 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 Syszone Co., Ltd. located?: Syszone Co., Ltd. is listed at 9F Garak, 310 Ogeum-ro Seoul Seoul, Korea KR 138-716 in the IEEE OUI registry entry for 64:DB:81. This is the address the organization registered with the IEEE, which may differ from its current operating address.