Which company owns MAC address prefix B8:D4:9D?

MAC address prefix B8:D4:9D is registered to M Seven System Ltd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with B8:D4:9D has a network interface built by M Seven System Ltd..

What is the OUI B8:D4:9D?

B8:D4:9D is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to M Seven System Ltd.. It covers every address from B8:D4:9D:00:00:00 to B8:D4:9D:FF:FF:FF, or 16,777,216 addresses in total. It is also written B8-D4-9D.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in B8:D4:9D:00:00:00 that is B8:D4:9D — 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 M Seven System Ltd. located?

M Seven System Ltd. is listed at 24F, Trust Tower Bldg, 275-7, Yangjae2-Dong, Seocho-Gu Seoul KR 137-739 in the IEEE OUI registry entry for B8:D4:9D. This is the address the organization registered with the IEEE, which may differ from its current operating address.

M Seven System Ltd.

MAC address prefix B8:D4:9D is registered to M Seven System Ltd. in the IEEE OUI registry. Any device whose MAC address begins with B8:D4:9D has a network interface built by M Seven System 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 B8:D4:9D:00:00:00 to B8:D4:9D:FF:FF:FF.

OUI prefix: B8:D4:9D
Hyphen form: B8-D4-9D
MAC range: B8:D4:9D:00:00:00 – B8:D4:9D:FF:FF:FF
Addresses in block: 16,777,216
Organization: M Seven System Ltd.
Address: 24F, Trust Tower Bldg, 275-7, Yangjae2-Dong, Seocho-Gu Seoul KR 137-739
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 "M Seven System Ltd."
archived source →
2026-07-17Assigned to "M Seven System Ltd."

Nearby in the registry

The prefixes assigned immediately before and after B8:D4:9D:

FAQ

Which company owns MAC address prefix B8:D4:9D?: MAC address prefix B8:D4:9D is registered to M Seven System Ltd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with B8:D4:9D has a network interface built by M Seven System Ltd..
What is the OUI B8:D4:9D?: B8:D4:9D is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to M Seven System Ltd.. It covers every address from B8:D4:9D:00:00:00 to B8:D4:9D:FF:FF:FF, or 16,777,216 addresses in total. It is also written B8-D4-9D.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in B8:D4:9D:00:00:00 that is B8:D4:9D — 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 M Seven System Ltd. located?: M Seven System Ltd. is listed at 24F, Trust Tower Bldg, 275-7, Yangjae2-Dong, Seocho-Gu Seoul KR 137-739 in the IEEE OUI registry entry for B8:D4:9D. This is the address the organization registered with the IEEE, which may differ from its current operating address.