Which company owns MAC address prefix 7C:E5:6B?

MAC address prefix 7C:E5:6B is registered to ESEN Optoelectronics Technology Co.,Ltd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 7C:E5:6B has a network interface built by ESEN Optoelectronics Technology Co.,Ltd..

What is the OUI 7C:E5:6B?

7C:E5:6B is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to ESEN Optoelectronics Technology Co.,Ltd.. It covers every address from 7C:E5:6B:00:00:00 to 7C:E5:6B:FF:FF:FF, or 16,777,216 addresses in total. It is also written 7C-E5-6B.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 7C:E5:6B:00:00:00 that is 7C:E5:6B — 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 ESEN Optoelectronics Technology Co.,Ltd. located?

ESEN Optoelectronics Technology Co.,Ltd. is listed at Houcheng Yuanjiaqiao ,Jingang Town Zhangjiagang Jiangsu CN 215631 in the IEEE OUI registry entry for 7C:E5:6B. This is the address the organization registered with the IEEE, which may differ from its current operating address.

ESEN Optoelectronics Technology Co.,Ltd.

MAC address prefix 7C:E5:6B is registered to ESEN Optoelectronics Technology Co.,Ltd. in the IEEE OUI registry. Any device whose MAC address begins with 7C:E5:6B has a network interface built by ESEN Optoelectronics Technology Co.,Ltd.. 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:E5:6B:00:00:00 to 7C:E5:6B:FF:FF:FF.

OUI prefix: 7C:E5:6B
Hyphen form: 7C-E5-6B
MAC range: 7C:E5:6B:00:00:00 – 7C:E5:6B:FF:FF:FF
Addresses in block: 16,777,216
Organization: ESEN Optoelectronics Technology Co.,Ltd.
Address: Houcheng Yuanjiaqiao ,Jingang Town Zhangjiagang Jiangsu CN 215631
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 "ESEN Optoelectronics Technology Co.,Ltd."
archived source →
2026-07-17Assigned to "ESEN Optoelectronics Technology Co.,Ltd."

Nearby in the registry

The prefixes assigned immediately before and after 7C:E5:6B:

FAQ

Which company owns MAC address prefix 7C:E5:6B?: MAC address prefix 7C:E5:6B is registered to ESEN Optoelectronics Technology Co.,Ltd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 7C:E5:6B has a network interface built by ESEN Optoelectronics Technology Co.,Ltd..
What is the OUI 7C:E5:6B?: 7C:E5:6B is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to ESEN Optoelectronics Technology Co.,Ltd.. It covers every address from 7C:E5:6B:00:00:00 to 7C:E5:6B:FF:FF:FF, or 16,777,216 addresses in total. It is also written 7C-E5-6B.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 7C:E5:6B:00:00:00 that is 7C:E5:6B — 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 ESEN Optoelectronics Technology Co.,Ltd. located?: ESEN Optoelectronics Technology Co.,Ltd. is listed at Houcheng Yuanjiaqiao ,Jingang Town Zhangjiagang Jiangsu CN 215631 in the IEEE OUI registry entry for 7C:E5:6B. This is the address the organization registered with the IEEE, which may differ from its current operating address.