Which company owns MAC address prefix B8:C8:55?

MAC address prefix B8:C8:55 is registered to Shanghai GBCOM Communication Technology Co.,Ltd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with B8:C8:55 has a network interface built by Shanghai GBCOM Communication Technology Co.,Ltd..

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in B8:C8:55:00:00:00 that is B8:C8:55 — 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.

Shanghai GBCOM Communication Technology Co.,Ltd.

MAC address prefix B8:C8:55 is registered to Shanghai GBCOM Communication Technology Co.,Ltd. in the IEEE OUI registry. Any device whose MAC address begins with B8:C8:55 has a network interface built by Shanghai GBCOM Communication 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 B8:C8:55:00:00:00 to B8:C8:55:FF:FF:FF.

OUI prefix: B8:C8:55
Hyphen form: B8-C8-55
MAC range: B8:C8:55:00:00:00 – B8:C8:55:FF:FF:FF
Addresses in block: 16,777,216
Organization: Shanghai GBCOM Communication Technology Co.,Ltd.
Address: Room 602, Building 6, No. Shanghai CN 200241
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 "Shanghai GBCOM Communication Technology Co.,Ltd."
archived source →
2026-07-17Assigned to "Shanghai GBCOM Communication Technology Co.,Ltd."

Nearby in the registry

The prefixes assigned immediately before and after B8:C8:55:

FAQ

Which company owns MAC address prefix B8:C8:55?: MAC address prefix B8:C8:55 is registered to Shanghai GBCOM Communication Technology Co.,Ltd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with B8:C8:55 has a network interface built by Shanghai GBCOM Communication Technology Co.,Ltd..
What is the OUI B8:C8:55?: B8:C8:55 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Shanghai GBCOM Communication Technology Co.,Ltd.. It covers every address from B8:C8:55:00:00:00 to B8:C8:55:FF:FF:FF, or 16,777,216 addresses in total. It is also written B8-C8-55.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in B8:C8:55:00:00:00 that is B8:C8:55 — 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 Shanghai GBCOM Communication Technology Co.,Ltd. located?: Shanghai GBCOM Communication Technology Co.,Ltd. is listed at Room 602, Building 6, No. Shanghai CN 200241 in the IEEE OUI registry entry for B8:C8:55. This is the address the organization registered with the IEEE, which may differ from its current operating address.