Which company owns MAC address prefix 7C:86:57?

MAC address prefix 7C:86:57 is registered to GTWAVE in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 7C:86:57 has a network interface built by GTWAVE.

What is the OUI 7C:86:57?

7C:86:57 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to GTWAVE. It covers every address from 7C:86:57:00:00:00 to 7C:86:57:FF:FF:FF, or 16,777,216 addresses in total. It is also written 7C-86-57.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 7C:86:57:00:00:00 that is 7C:86:57 — 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 GTWAVE located?

GTWAVE is listed at #804-2 Bdong, 723, Pangyo-ro, Bundang-gu, Seongnam-si, Gyeonggi-do Republic of Korea Seongnam Gyeonggi-do KR 13511 in the IEEE OUI registry entry for 7C:86:57. This is the address the organization registered with the IEEE, which may differ from its current operating address.

GTWAVE

MAC address prefix 7C:86:57 is registered to GTWAVE in the IEEE OUI registry. Any device whose MAC address begins with 7C:86:57 has a network interface built by GTWAVE. 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:86:57:00:00:00 to 7C:86:57:FF:FF:FF.

OUI prefix: 7C:86:57
Hyphen form: 7C-86-57
MAC range: 7C:86:57:00:00:00 – 7C:86:57:FF:FF:FF
Addresses in block: 16,777,216
Organization: GTWAVE
Address: #804-2 Bdong, 723, Pangyo-ro, Bundang-gu, Seongnam-si, Gyeonggi-do Republic of Korea Seongnam Gyeonggi-do KR 13511
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 (1)

The IEEE registry publishes current state only — this is the change record we've kept since we started tracking it daily.

2026-09-09Assigned to "GTWAVE"

Nearby in the registry

The prefixes assigned immediately before and after 7C:86:57:

FAQ

Which company owns MAC address prefix 7C:86:57?: MAC address prefix 7C:86:57 is registered to GTWAVE in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 7C:86:57 has a network interface built by GTWAVE.
What is the OUI 7C:86:57?: 7C:86:57 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to GTWAVE. It covers every address from 7C:86:57:00:00:00 to 7C:86:57:FF:FF:FF, or 16,777,216 addresses in total. It is also written 7C-86-57.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 7C:86:57:00:00:00 that is 7C:86:57 — 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 GTWAVE located?: GTWAVE is listed at #804-2 Bdong, 723, Pangyo-ro, Bundang-gu, Seongnam-si, Gyeonggi-do Republic of Korea Seongnam Gyeonggi-do KR 13511 in the IEEE OUI registry entry for 7C:86:57. This is the address the organization registered with the IEEE, which may differ from its current operating address.