Which company owns MAC address prefix B4:5C:A4?

MAC address prefix B4:5C:A4 is registered to Thing-talk Wireless Communication Technologies Corporation Limited in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with B4:5C:A4 has a network interface built by Thing-talk Wireless Communication Technologies Corporation Limited.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in B4:5C:A4:00:00:00 that is B4:5C:A4 — 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.

Thing-talk Wireless Communication Technologies Corporation Limited

MAC address prefix B4:5C:A4 is registered to Thing-talk Wireless Communication Technologies Corporation Limited in the IEEE OUI registry. Any device whose MAC address begins with B4:5C:A4 has a network interface built by Thing-talk Wireless Communication Technologies Corporation Limited. 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 B4:5C:A4:00:00:00 to B4:5C:A4:FF:FF:FF.

OUI prefix: B4:5C:A4
Hyphen form: B4-5C-A4
MAC range: B4:5C:A4:00:00:00 – B4:5C:A4:FF:FF:FF
Addresses in block: 16,777,216
Organization: Thing-talk Wireless Communication Technologies Corporation Limited
Address: 498 Guo Shou Jing Road, Suite 10402 Shanghai CN 201203
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 "Thing-talk Wireless Communication Technologies Corporation Limited"
archived source →
2026-07-17Assigned to "Thing-talk Wireless Communication Technologies Corporation Limited"

Nearby in the registry

The prefixes assigned immediately before and after B4:5C:A4:

FAQ

Which company owns MAC address prefix B4:5C:A4?: MAC address prefix B4:5C:A4 is registered to Thing-talk Wireless Communication Technologies Corporation Limited in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with B4:5C:A4 has a network interface built by Thing-talk Wireless Communication Technologies Corporation Limited.
What is the OUI B4:5C:A4?: B4:5C:A4 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Thing-talk Wireless Communication Technologies Corporation Limited. It covers every address from B4:5C:A4:00:00:00 to B4:5C:A4:FF:FF:FF, or 16,777,216 addresses in total. It is also written B4-5C-A4.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in B4:5C:A4:00:00:00 that is B4:5C:A4 — 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 Thing-talk Wireless Communication Technologies Corporation Limited located?: Thing-talk Wireless Communication Technologies Corporation Limited is listed at 498 Guo Shou Jing Road, Suite 10402 Shanghai CN 201203 in the IEEE OUI registry entry for B4:5C:A4. This is the address the organization registered with the IEEE, which may differ from its current operating address.