Which company owns MAC address prefix E0:05:1C?

MAC address prefix E0:05:1C is registered to GigaDevice Semiconductor Inc. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with E0:05:1C has a network interface built by GigaDevice Semiconductor Inc..

What is the OUI E0:05:1C?

E0:05:1C is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to GigaDevice Semiconductor Inc.. It covers every address from E0:05:1C:00:00:00 to E0:05:1C:FF:FF:FF, or 16,777,216 addresses in total. It is also written E0-05-1C.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in E0:05:1C:00:00:00 that is E0:05:1C — 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 GigaDevice Semiconductor Inc. located?

GigaDevice Semiconductor Inc. is listed at Building No. 8, IC Park, No. 9 Fenghao East Road, Haidian District Beijing CN 100094 in the IEEE OUI registry entry for E0:05:1C. This is the address the organization registered with the IEEE, which may differ from its current operating address.

GigaDevice Semiconductor Inc.

MAC address prefix E0:05:1C is registered to GigaDevice Semiconductor Inc. in the IEEE OUI registry. Any device whose MAC address begins with E0:05:1C has a network interface built by GigaDevice Semiconductor 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 E0:05:1C:00:00:00 to E0:05:1C:FF:FF:FF.

OUI prefix: E0:05:1C
Hyphen form: E0-05-1C
MAC range: E0:05:1C:00:00:00 – E0:05:1C:FF:FF:FF
Addresses in block: 16,777,216
Organization: GigaDevice Semiconductor Inc.
Address: Building No. 8, IC Park, No. 9 Fenghao East Road, Haidian District Beijing CN 100094
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.

2025-05-13Assigned to "GigaDevice Semiconductor Inc."
archived source →
2026-07-17Assigned to "GigaDevice Semiconductor Inc."

Nearby in the registry

The prefixes assigned immediately before and after E0:05:1C:

FAQ

Which company owns MAC address prefix E0:05:1C?: MAC address prefix E0:05:1C is registered to GigaDevice Semiconductor Inc. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with E0:05:1C has a network interface built by GigaDevice Semiconductor Inc..
What is the OUI E0:05:1C?: E0:05:1C is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to GigaDevice Semiconductor Inc.. It covers every address from E0:05:1C:00:00:00 to E0:05:1C:FF:FF:FF, or 16,777,216 addresses in total. It is also written E0-05-1C.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in E0:05:1C:00:00:00 that is E0:05:1C — 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 GigaDevice Semiconductor Inc. located?: GigaDevice Semiconductor Inc. is listed at Building No. 8, IC Park, No. 9 Fenghao East Road, Haidian District Beijing CN 100094 in the IEEE OUI registry entry for E0:05:1C. This is the address the organization registered with the IEEE, which may differ from its current operating address.