Which company owns MAC address prefix D8:A1:05?

MAC address prefix D8:A1:05 is registered to Syslane, Co., Ltd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with D8:A1:05 has a network interface built by Syslane, Co., Ltd..

What is the OUI D8:A1:05?

D8:A1:05 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Syslane, Co., Ltd.. It covers every address from D8:A1:05:00:00:00 to D8:A1:05:FF:FF:FF, or 16,777,216 addresses in total. It is also written D8-A1-05.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in D8:A1:05:00:00:00 that is D8:A1:05 — 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 Syslane, Co., Ltd. located?

Syslane, Co., Ltd. is listed at #1201, Megacenter, SKntechno-park,, Sangdaeweon-dong, Joongweon-gu Seongnam Outside the US, Mexico, or Canada KR 462-721 in the IEEE OUI registry entry for D8:A1:05. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Syslane, Co., Ltd.

MAC address prefix D8:A1:05 is registered to Syslane, Co., Ltd. in the IEEE OUI registry. Any device whose MAC address begins with D8:A1:05 has a network interface built by Syslane, 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 D8:A1:05:00:00:00 to D8:A1:05:FF:FF:FF.

OUI prefix: D8:A1:05
Hyphen form: D8-A1-05
MAC range: D8:A1:05:00:00:00 – D8:A1:05:FF:FF:FF
Addresses in block: 16,777,216
Organization: Syslane, Co., Ltd.
Address: #1201, Megacenter, SKntechno-park,, Sangdaeweon-dong, Joongweon-gu Seongnam Outside the US, Mexico, or Canada KR 462-721
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.

2017-09-08Assigned to "Syslane, Co., Ltd."
archived source →
2026-07-17Assigned to "Syslane, Co., Ltd."

Nearby in the registry

The prefixes assigned immediately before and after D8:A1:05:

FAQ

Which company owns MAC address prefix D8:A1:05?: MAC address prefix D8:A1:05 is registered to Syslane, Co., Ltd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with D8:A1:05 has a network interface built by Syslane, Co., Ltd..
What is the OUI D8:A1:05?: D8:A1:05 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Syslane, Co., Ltd.. It covers every address from D8:A1:05:00:00:00 to D8:A1:05:FF:FF:FF, or 16,777,216 addresses in total. It is also written D8-A1-05.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in D8:A1:05:00:00:00 that is D8:A1:05 — 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 Syslane, Co., Ltd. located?: Syslane, Co., Ltd. is listed at #1201, Megacenter, SKntechno-park,, Sangdaeweon-dong, Joongweon-gu Seongnam Outside the US, Mexico, or Canada KR 462-721 in the IEEE OUI registry entry for D8:A1:05. This is the address the organization registered with the IEEE, which may differ from its current operating address.