Which company owns MAC address prefix 70:B6:51?

MAC address prefix 70:B6:51 is registered to Eight Sleep in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 70:B6:51 has a network interface built by Eight Sleep.

What is the OUI 70:B6:51?

70:B6:51 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Eight Sleep. It covers every address from 70:B6:51:00:00:00 to 70:B6:51:FF:FF:FF, or 16,777,216 addresses in total. It is also written 70-B6-51.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 70:B6:51:00:00:00 that is 70:B6:51 — 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 Eight Sleep located?

Eight Sleep is listed at 212 W 35th St Floor 4 New York NY US 10123 in the IEEE OUI registry entry for 70:B6:51. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Eight Sleep

MAC address prefix 70:B6:51 is registered to Eight Sleep in the IEEE OUI registry. Any device whose MAC address begins with 70:B6:51 has a network interface built by Eight Sleep. 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 70:B6:51:00:00:00 to 70:B6:51:FF:FF:FF.

OUI prefix: 70:B6:51
Hyphen form: 70-B6-51
MAC range: 70:B6:51:00:00:00 – 70:B6:51:FF:FF:FF
Addresses in block: 16,777,216
Organization: Eight Sleep
Address: 212 W 35th St Floor 4 New York NY US 10123
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.

2023-07-11Assigned to "Eight Sleep"
archived source →
2026-07-17Assigned to "Eight Sleep"

Nearby in the registry

The prefixes assigned immediately before and after 70:B6:51:

FAQ

Which company owns MAC address prefix 70:B6:51?: MAC address prefix 70:B6:51 is registered to Eight Sleep in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 70:B6:51 has a network interface built by Eight Sleep.
What is the OUI 70:B6:51?: 70:B6:51 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Eight Sleep. It covers every address from 70:B6:51:00:00:00 to 70:B6:51:FF:FF:FF, or 16,777,216 addresses in total. It is also written 70-B6-51.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 70:B6:51:00:00:00 that is 70:B6:51 — 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 Eight Sleep located?: Eight Sleep is listed at 212 W 35th St Floor 4 New York NY US 10123 in the IEEE OUI registry entry for 70:B6:51. This is the address the organization registered with the IEEE, which may differ from its current operating address.