Which company owns MAC address prefix B4:39:34?

MAC address prefix B4:39:34 is registered to Pen Generations, Inc. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with B4:39:34 has a network interface built by Pen Generations, Inc..

What is the OUI B4:39:34?

B4:39:34 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Pen Generations, Inc.. It covers every address from B4:39:34:00:00:00 to B4:39:34:FF:FF:FF, or 16,777,216 addresses in total. It is also written B4-39-34.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in B4:39:34:00:00:00 that is B4:39:34 — 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 Pen Generations, Inc. located?

Pen Generations, Inc. is listed at 8th FL., SOLiD Space, Seongnam-si Gyeonggi-do KR 463-400 in the IEEE OUI registry entry for B4:39:34. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Pen Generations, Inc.

MAC address prefix B4:39:34 is registered to Pen Generations, Inc. in the IEEE OUI registry. Any device whose MAC address begins with B4:39:34 has a network interface built by Pen Generations, 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 B4:39:34:00:00:00 to B4:39:34:FF:FF:FF.

OUI prefix: B4:39:34
Hyphen form: B4-39-34
MAC range: B4:39:34:00:00:00 – B4:39:34:FF:FF:FF
Addresses in block: 16,777,216
Organization: Pen Generations, Inc.
Address: 8th FL., SOLiD Space, Seongnam-si Gyeonggi-do KR 463-400
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 "Pen Generations, Inc."
archived source →
2026-07-17Assigned to "Pen Generations, Inc."

Nearby in the registry

The prefixes assigned immediately before and after B4:39:34:

FAQ

Which company owns MAC address prefix B4:39:34?: MAC address prefix B4:39:34 is registered to Pen Generations, Inc. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with B4:39:34 has a network interface built by Pen Generations, Inc..
What is the OUI B4:39:34?: B4:39:34 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Pen Generations, Inc.. It covers every address from B4:39:34:00:00:00 to B4:39:34:FF:FF:FF, or 16,777,216 addresses in total. It is also written B4-39-34.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in B4:39:34:00:00:00 that is B4:39:34 — 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 Pen Generations, Inc. located?: Pen Generations, Inc. is listed at 8th FL., SOLiD Space, Seongnam-si Gyeonggi-do KR 463-400 in the IEEE OUI registry entry for B4:39:34. This is the address the organization registered with the IEEE, which may differ from its current operating address.