Which company owns MAC address prefix 74:27:3C?

MAC address prefix 74:27:3C is registered to ChangYang Technology (Nanjing) Co., LTD in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 74:27:3C has a network interface built by ChangYang Technology (Nanjing) Co., LTD.

What is the OUI 74:27:3C?

74:27:3C is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to ChangYang Technology (Nanjing) Co., LTD. It covers every address from 74:27:3C:00:00:00 to 74:27:3C:FF:FF:FF, or 16,777,216 addresses in total. It is also written 74-27-3C.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 74:27:3C:00:00:00 that is 74:27:3C — 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 ChangYang Technology (Nanjing) Co., LTD located?

ChangYang Technology (Nanjing) Co., LTD is listed at NO.9 KaiCheng Road,QiLinTown NanJing JiangSu CN 211100 in the IEEE OUI registry entry for 74:27:3C. This is the address the organization registered with the IEEE, which may differ from its current operating address.

ChangYang Technology (Nanjing) Co., LTD

MAC address prefix 74:27:3C is registered to ChangYang Technology (Nanjing) Co., LTD in the IEEE OUI registry. Any device whose MAC address begins with 74:27:3C has a network interface built by ChangYang Technology (Nanjing) 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 74:27:3C:00:00:00 to 74:27:3C:FF:FF:FF.

OUI prefix: 74:27:3C
Hyphen form: 74-27-3C
MAC range: 74:27:3C:00:00:00 – 74:27:3C:FF:FF:FF
Addresses in block: 16,777,216
Organization: ChangYang Technology (Nanjing) Co., LTD
Address: NO.9 KaiCheng Road,QiLinTown NanJing JiangSu CN 211100
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 "ChangYang Technology (Nanjing) Co., LTD"
archived source →
2026-07-17Assigned to "ChangYang Technology (Nanjing) Co., LTD"

Nearby in the registry

The prefixes assigned immediately before and after 74:27:3C:

FAQ

Which company owns MAC address prefix 74:27:3C?: MAC address prefix 74:27:3C is registered to ChangYang Technology (Nanjing) Co., LTD in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 74:27:3C has a network interface built by ChangYang Technology (Nanjing) Co., LTD.
What is the OUI 74:27:3C?: 74:27:3C is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to ChangYang Technology (Nanjing) Co., LTD. It covers every address from 74:27:3C:00:00:00 to 74:27:3C:FF:FF:FF, or 16,777,216 addresses in total. It is also written 74-27-3C.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 74:27:3C:00:00:00 that is 74:27:3C — 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 ChangYang Technology (Nanjing) Co., LTD located?: ChangYang Technology (Nanjing) Co., LTD is listed at NO.9 KaiCheng Road,QiLinTown NanJing JiangSu CN 211100 in the IEEE OUI registry entry for 74:27:3C. This is the address the organization registered with the IEEE, which may differ from its current operating address.