Which company owns MAC address prefix 1C:05:B7?

MAC address prefix 1C:05:B7 is registered to Chongqing Trantor Technology Co., Ltd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 1C:05:B7 has a network interface built by Chongqing Trantor Technology Co., Ltd..

What is the OUI 1C:05:B7?

1C:05:B7 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Chongqing Trantor Technology Co., Ltd.. It covers every address from 1C:05:B7:00:00:00 to 1C:05:B7:FF:FF:FF, or 16,777,216 addresses in total. It is also written 1C-05-B7.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 1C:05:B7:00:00:00 that is 1C:05:B7 — 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 Chongqing Trantor Technology Co., Ltd. located?

Chongqing Trantor Technology Co., Ltd. is listed at No.69,Huoju Avenue,Jiulongpo District. Chongqing Chongqing CN 400050 in the IEEE OUI registry entry for 1C:05:B7. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Chongqing Trantor Technology Co., Ltd.

MAC address prefix 1C:05:B7 is registered to Chongqing Trantor Technology Co., Ltd. in the IEEE OUI registry. Any device whose MAC address begins with 1C:05:B7 has a network interface built by Chongqing Trantor 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 1C:05:B7:00:00:00 to 1C:05:B7:FF:FF:FF.

OUI prefix: 1C:05:B7
Hyphen form: 1C-05-B7
MAC range: 1C:05:B7:00:00:00 – 1C:05:B7:FF:FF:FF
Addresses in block: 16,777,216
Organization: Chongqing Trantor Technology Co., Ltd.
Address: No.69,Huoju Avenue,Jiulongpo District. Chongqing Chongqing CN 400050
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.

2020-03-21Assigned to "Chongqing Trantor Technology Co., Ltd."
archived source →
2026-07-17Assigned to "Chongqing Trantor Technology Co., Ltd."

Nearby in the registry

The prefixes assigned immediately before and after 1C:05:B7:

FAQ

Which company owns MAC address prefix 1C:05:B7?: MAC address prefix 1C:05:B7 is registered to Chongqing Trantor Technology Co., Ltd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 1C:05:B7 has a network interface built by Chongqing Trantor Technology Co., Ltd..
What is the OUI 1C:05:B7?: 1C:05:B7 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Chongqing Trantor Technology Co., Ltd.. It covers every address from 1C:05:B7:00:00:00 to 1C:05:B7:FF:FF:FF, or 16,777,216 addresses in total. It is also written 1C-05-B7.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 1C:05:B7:00:00:00 that is 1C:05:B7 — 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 Chongqing Trantor Technology Co., Ltd. located?: Chongqing Trantor Technology Co., Ltd. is listed at No.69,Huoju Avenue,Jiulongpo District. Chongqing Chongqing CN 400050 in the IEEE OUI registry entry for 1C:05:B7. This is the address the organization registered with the IEEE, which may differ from its current operating address.