Which company owns MAC address prefix DC:B4:E8?

MAC address prefix DC:B4:E8 is registered to Byos in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with DC:B4:E8 has a network interface built by Byos.

What is the OUI DC:B4:E8?

DC:B4:E8 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Byos. It covers every address from DC:B4:E8:00:00:00 to DC:B4:E8:FF:FF:FF, or 16,777,216 addresses in total. It is also written DC-B4-E8.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in DC:B4:E8:00:00:00 that is DC:B4:E8 — 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 Byos located?

Byos is listed at 20130 Lakeview Center Plaza, Suite 400 Ashburn VA US 20147 in the IEEE OUI registry entry for DC:B4:E8. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Byos

MAC address prefix DC:B4:E8 is registered to Byos in the IEEE OUI registry. Any device whose MAC address begins with DC:B4:E8 has a network interface built by Byos. 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 DC:B4:E8:00:00:00 to DC:B4:E8:FF:FF:FF.

OUI prefix: DC:B4:E8
Hyphen form: DC-B4-E8
MAC range: DC:B4:E8:00:00:00 – DC:B4:E8:FF:FF:FF
Addresses in block: 16,777,216
Organization: Byos
Address: 20130 Lakeview Center Plaza, Suite 400 Ashburn VA US 20147
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.

2026-01-08Assigned to "Byos"
archived source →
2026-07-17Assigned to "Byos"

Nearby in the registry

The prefixes assigned immediately before and after DC:B4:E8:

FAQ

Which company owns MAC address prefix DC:B4:E8?: MAC address prefix DC:B4:E8 is registered to Byos in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with DC:B4:E8 has a network interface built by Byos.
What is the OUI DC:B4:E8?: DC:B4:E8 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Byos. It covers every address from DC:B4:E8:00:00:00 to DC:B4:E8:FF:FF:FF, or 16,777,216 addresses in total. It is also written DC-B4-E8.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in DC:B4:E8:00:00:00 that is DC:B4:E8 — 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 Byos located?: Byos is listed at 20130 Lakeview Center Plaza, Suite 400 Ashburn VA US 20147 in the IEEE OUI registry entry for DC:B4:E8. This is the address the organization registered with the IEEE, which may differ from its current operating address.