Which company owns MAC address prefix A8:58:40?

MAC address prefix A8:58:40 is registered to Cambridge Industries(Group) Co.,Ltd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with A8:58:40 has a network interface built by Cambridge Industries(Group) Co.,Ltd..

What is the OUI A8:58:40?

A8:58:40 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Cambridge Industries(Group) Co.,Ltd.. It covers every address from A8:58:40:00:00:00 to A8:58:40:FF:FF:FF, or 16,777,216 addresses in total. It is also written A8-58-40.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in A8:58:40:00:00:00 that is A8:58:40 — 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 Cambridge Industries(Group) Co.,Ltd. located?

Cambridge Industries(Group) Co.,Ltd. is listed at 5/F,Building 8, 2388 ChenHang Road, MinHang District shanghai CN 201114 in the IEEE OUI registry entry for A8:58:40. This is the address the organization registered with the IEEE, which may differ from its current operating address.

How many MAC prefixes does Cambridge Industries(Group) Co.,Ltd. own?

Cambridge Industries(Group) Co.,Ltd. holds 12 OUI prefixes in the IEEE registry, of which A8:58:40 is one. A device made by Cambridge Industries(Group) Co.,Ltd. could carry a MAC address from any of them.

Cambridge Industries(Group) Co.,Ltd.

MAC address prefix A8:58:40 is registered to Cambridge Industries(Group) Co.,Ltd. in the IEEE OUI registry. Any device whose MAC address begins with A8:58:40 has a network interface built by Cambridge Industries(Group) 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 A8:58:40:00:00:00 to A8:58:40:FF:FF:FF.

OUI prefix: A8:58:40
Hyphen form: A8-58-40
MAC range: A8:58:40:00:00:00 – A8:58:40:FF:FF:FF
Addresses in block: 16,777,216
Organization: Cambridge Industries(Group) Co.,Ltd.
Address: 5/F,Building 8, 2388 ChenHang Road, MinHang District shanghai CN 201114
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.

Other prefixes from Cambridge Industries(Group) Co.,Ltd.

Cambridge Industries(Group) Co.,Ltd. holds 12 OUI prefixes in total. A device with this exact prefix could just as well carry any of these:

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 "Cambridge Industries(Group) Co.,Ltd."
archived source →
2026-07-17Assigned to "Cambridge Industries(Group) Co.,Ltd."

Nearby in the registry

The prefixes assigned immediately before and after A8:58:40:

FAQ

Which company owns MAC address prefix A8:58:40?: MAC address prefix A8:58:40 is registered to Cambridge Industries(Group) Co.,Ltd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with A8:58:40 has a network interface built by Cambridge Industries(Group) Co.,Ltd..
What is the OUI A8:58:40?: A8:58:40 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Cambridge Industries(Group) Co.,Ltd.. It covers every address from A8:58:40:00:00:00 to A8:58:40:FF:FF:FF, or 16,777,216 addresses in total. It is also written A8-58-40.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in A8:58:40:00:00:00 that is A8:58:40 — 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 Cambridge Industries(Group) Co.,Ltd. located?: Cambridge Industries(Group) Co.,Ltd. is listed at 5/F,Building 8, 2388 ChenHang Road, MinHang District shanghai CN 201114 in the IEEE OUI registry entry for A8:58:40. This is the address the organization registered with the IEEE, which may differ from its current operating address.
How many MAC prefixes does Cambridge Industries(Group) Co.,Ltd. own?: Cambridge Industries(Group) Co.,Ltd. holds 12 OUI prefixes in the IEEE registry, of which A8:58:40 is one. A device made by Cambridge Industries(Group) Co.,Ltd. could carry a MAC address from any of them.