Which company owns MAC address prefix E4:01:77?

MAC address prefix E4:01:77 is registered to SafeOwl, Inc. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with E4:01:77 has a network interface built by SafeOwl, Inc..

What is the OUI E4:01:77?

E4:01:77 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to SafeOwl, Inc.. It covers every address from E4:01:77:00:00:00 to E4:01:77:FF:FF:FF, or 16,777,216 addresses in total. It is also written E4-01-77.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in E4:01:77:00:00:00 that is E4:01:77 — 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 SafeOwl, Inc. located?

SafeOwl, Inc. is listed at 8350 N. Central Expwy #1150 Dallas TX US 75206 in the IEEE OUI registry entry for E4:01:77. This is the address the organization registered with the IEEE, which may differ from its current operating address.

SafeOwl, Inc.

MAC address prefix E4:01:77 is registered to SafeOwl, Inc. in the IEEE OUI registry. Any device whose MAC address begins with E4:01:77 has a network interface built by SafeOwl, 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 E4:01:77:00:00:00 to E4:01:77:FF:FF:FF.

OUI prefix: E4:01:77
Hyphen form: E4-01-77
MAC range: E4:01:77:00:00:00 – E4:01:77:FF:FF:FF
Addresses in block: 16,777,216
Organization: SafeOwl, Inc.
Address: 8350 N. Central Expwy #1150 Dallas TX US 75206
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 "SafeOwl, Inc."
archived source →
2026-07-17Assigned to "SafeOwl, Inc."

Nearby in the registry

The prefixes assigned immediately before and after E4:01:77:

FAQ

Which company owns MAC address prefix E4:01:77?: MAC address prefix E4:01:77 is registered to SafeOwl, Inc. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with E4:01:77 has a network interface built by SafeOwl, Inc..
What is the OUI E4:01:77?: E4:01:77 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to SafeOwl, Inc.. It covers every address from E4:01:77:00:00:00 to E4:01:77:FF:FF:FF, or 16,777,216 addresses in total. It is also written E4-01-77.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in E4:01:77:00:00:00 that is E4:01:77 — 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 SafeOwl, Inc. located?: SafeOwl, Inc. is listed at 8350 N. Central Expwy #1150 Dallas TX US 75206 in the IEEE OUI registry entry for E4:01:77. This is the address the organization registered with the IEEE, which may differ from its current operating address.