Which company owns MAC address prefix B4:21:8A?

MAC address prefix B4:21:8A is registered to Dog Hunter LLC in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with B4:21:8A has a network interface built by Dog Hunter LLC.

What is the OUI B4:21:8A?

B4:21:8A is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Dog Hunter LLC. It covers every address from B4:21:8A:00:00:00 to B4:21:8A:FF:FF:FF, or 16,777,216 addresses in total. It is also written B4-21-8A.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in B4:21:8A:00:00:00 that is B4:21:8A — 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 Dog Hunter LLC located?

Dog Hunter LLC is listed at 8 Faneuil Hall SQ Boston MA US 02109 in the IEEE OUI registry entry for B4:21:8A. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Dog Hunter LLC

MAC address prefix B4:21:8A is registered to Dog Hunter LLC in the IEEE OUI registry. Any device whose MAC address begins with B4:21:8A has a network interface built by Dog Hunter LLC. 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 B4:21:8A:00:00:00 to B4:21:8A:FF:FF:FF.

OUI prefix: B4:21:8A
Hyphen form: B4-21-8A
MAC range: B4:21:8A:00:00:00 – B4:21:8A:FF:FF:FF
Addresses in block: 16,777,216
Organization: Dog Hunter LLC
Address: 8 Faneuil Hall SQ Boston MA US 02109
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 "Dog Hunter LLC"
archived source →
2026-07-17Assigned to "Dog Hunter LLC"

Nearby in the registry

The prefixes assigned immediately before and after B4:21:8A:

FAQ

Which company owns MAC address prefix B4:21:8A?: MAC address prefix B4:21:8A is registered to Dog Hunter LLC in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with B4:21:8A has a network interface built by Dog Hunter LLC.
What is the OUI B4:21:8A?: B4:21:8A is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Dog Hunter LLC. It covers every address from B4:21:8A:00:00:00 to B4:21:8A:FF:FF:FF, or 16,777,216 addresses in total. It is also written B4-21-8A.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in B4:21:8A:00:00:00 that is B4:21:8A — 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 Dog Hunter LLC located?: Dog Hunter LLC is listed at 8 Faneuil Hall SQ Boston MA US 02109 in the IEEE OUI registry entry for B4:21:8A. This is the address the organization registered with the IEEE, which may differ from its current operating address.