Which company owns MAC address prefix 58:4D:42?

MAC address prefix 58:4D:42 is registered to Dragos, Inc. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 58:4D:42 has a network interface built by Dragos, Inc..

What is the OUI 58:4D:42?

58:4D:42 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Dragos, Inc.. It covers every address from 58:4D:42:00:00:00 to 58:4D:42:FF:FF:FF, or 16,777,216 addresses in total. It is also written 58-4D-42.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 58:4D:42:00:00:00 that is 58:4D:42 — 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 Dragos, Inc. located?

Dragos, Inc. is listed at 1745 Dorsey Rd, Suite R Hanover MD US 21076 in the IEEE OUI registry entry for 58:4D:42. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Dragos, Inc.

MAC address prefix 58:4D:42 is registered to Dragos, Inc. in the IEEE OUI registry. Any device whose MAC address begins with 58:4D:42 has a network interface built by Dragos, 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 58:4D:42:00:00:00 to 58:4D:42:FF:FF:FF.

OUI prefix: 58:4D:42
Hyphen form: 58-4D-42
MAC range: 58:4D:42:00:00:00 – 58:4D:42:FF:FF:FF
Addresses in block: 16,777,216
Organization: Dragos, Inc.
Address: 1745 Dorsey Rd, Suite R Hanover MD US 21076
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.

2021-06-10Assigned to "Dragos, Inc."
archived source →
2026-07-17Assigned to "Dragos, Inc."

Nearby in the registry

The prefixes assigned immediately before and after 58:4D:42:

FAQ

Which company owns MAC address prefix 58:4D:42?: MAC address prefix 58:4D:42 is registered to Dragos, Inc. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 58:4D:42 has a network interface built by Dragos, Inc..
What is the OUI 58:4D:42?: 58:4D:42 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Dragos, Inc.. It covers every address from 58:4D:42:00:00:00 to 58:4D:42:FF:FF:FF, or 16,777,216 addresses in total. It is also written 58-4D-42.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 58:4D:42:00:00:00 that is 58:4D:42 — 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 Dragos, Inc. located?: Dragos, Inc. is listed at 1745 Dorsey Rd, Suite R Hanover MD US 21076 in the IEEE OUI registry entry for 58:4D:42. This is the address the organization registered with the IEEE, which may differ from its current operating address.