Which company owns MAC address prefix 7C:39:20?

MAC address prefix 7C:39:20 is registered to SSOMA SECURITY in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 7C:39:20 has a network interface built by SSOMA SECURITY.

What is the OUI 7C:39:20?

7C:39:20 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to SSOMA SECURITY. It covers every address from 7C:39:20:00:00:00 to 7C:39:20:FF:FF:FF, or 16,777,216 addresses in total. It is also written 7C-39-20.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 7C:39:20:00:00:00 that is 7C:39:20 — 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 SSOMA SECURITY located?

SSOMA SECURITY is listed at Unit 703, Daeryung Technotown 13th, Geumcheongu Seoul KR 153754 in the IEEE OUI registry entry for 7C:39:20. This is the address the organization registered with the IEEE, which may differ from its current operating address.

SSOMA SECURITY

MAC address prefix 7C:39:20 is registered to SSOMA SECURITY in the IEEE OUI registry. Any device whose MAC address begins with 7C:39:20 has a network interface built by SSOMA SECURITY. 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 7C:39:20:00:00:00 to 7C:39:20:FF:FF:FF.

OUI prefix: 7C:39:20
Hyphen form: 7C-39-20
MAC range: 7C:39:20:00:00:00 – 7C:39:20:FF:FF:FF
Addresses in block: 16,777,216
Organization: SSOMA SECURITY
Address: Unit 703, Daeryung Technotown 13th, Geumcheongu Seoul KR 153754
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 "SSOMA SECURITY"
archived source →
2026-07-17Assigned to "SSOMA SECURITY"

Nearby in the registry

The prefixes assigned immediately before and after 7C:39:20:

FAQ

Which company owns MAC address prefix 7C:39:20?: MAC address prefix 7C:39:20 is registered to SSOMA SECURITY in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 7C:39:20 has a network interface built by SSOMA SECURITY.
What is the OUI 7C:39:20?: 7C:39:20 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to SSOMA SECURITY. It covers every address from 7C:39:20:00:00:00 to 7C:39:20:FF:FF:FF, or 16,777,216 addresses in total. It is also written 7C-39-20.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 7C:39:20:00:00:00 that is 7C:39:20 — 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 SSOMA SECURITY located?: SSOMA SECURITY is listed at Unit 703, Daeryung Technotown 13th, Geumcheongu Seoul KR 153754 in the IEEE OUI registry entry for 7C:39:20. This is the address the organization registered with the IEEE, which may differ from its current operating address.