Which company owns MAC address prefix 04:A9:59?

MAC address prefix 04:A9:59 is registered to New H3C Technologies Co., Ltd in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 04:A9:59 has a network interface built by New H3C Technologies Co., Ltd.

What is the OUI 04:A9:59?

04:A9:59 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to New H3C Technologies Co., Ltd. It covers every address from 04:A9:59:00:00:00 to 04:A9:59:FF:FF:FF, or 16,777,216 addresses in total. It is also written 04-A9-59.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 04:A9:59:00:00:00 that is 04:A9:59 — 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 New H3C Technologies Co., Ltd located?

New H3C Technologies Co., Ltd is listed at 466 Changhe Road, Binjiang District Hangzhou Zhejiang CN 310052 in the IEEE OUI registry entry for 04:A9:59. This is the address the organization registered with the IEEE, which may differ from its current operating address.

How many MAC prefixes does New H3C Technologies Co., Ltd own?

New H3C Technologies Co., Ltd holds 138 OUI prefixes in the IEEE registry, of which 04:A9:59 is one. A device made by New H3C Technologies Co., Ltd could carry a MAC address from any of them.

New H3C Technologies Co., Ltd

MAC address prefix 04:A9:59 is registered to New H3C Technologies Co., Ltd in the IEEE OUI registry. Any device whose MAC address begins with 04:A9:59 has a network interface built by New H3C Technologies 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 04:A9:59:00:00:00 to 04:A9:59:FF:FF:FF.

OUI prefix: 04:A9:59
Hyphen form: 04-A9-59
MAC range: 04:A9:59:00:00:00 – 04:A9:59:FF:FF:FF
Addresses in block: 16,777,216
Organization: New H3C Technologies Co., Ltd
Address: 466 Changhe Road, Binjiang District Hangzhou Zhejiang CN 310052
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 New H3C Technologies Co., Ltd

New H3C Technologies Co., Ltd holds 138 OUI prefixes in total. A device with this exact prefix could just as well carry any of these:

Assignment history (1)

The IEEE registry publishes current state only — this is the change record we've kept since we started tracking it daily.

2026-07-17Assigned to "New H3C Technologies Co., Ltd"

Nearby in the registry

The prefixes assigned immediately before and after 04:A9:59:

FAQ

Which company owns MAC address prefix 04:A9:59?: MAC address prefix 04:A9:59 is registered to New H3C Technologies Co., Ltd in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 04:A9:59 has a network interface built by New H3C Technologies Co., Ltd.
What is the OUI 04:A9:59?: 04:A9:59 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to New H3C Technologies Co., Ltd. It covers every address from 04:A9:59:00:00:00 to 04:A9:59:FF:FF:FF, or 16,777,216 addresses in total. It is also written 04-A9-59.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 04:A9:59:00:00:00 that is 04:A9:59 — 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 New H3C Technologies Co., Ltd located?: New H3C Technologies Co., Ltd is listed at 466 Changhe Road, Binjiang District Hangzhou Zhejiang CN 310052 in the IEEE OUI registry entry for 04:A9:59. This is the address the organization registered with the IEEE, which may differ from its current operating address.
How many MAC prefixes does New H3C Technologies Co., Ltd own?: New H3C Technologies Co., Ltd holds 138 OUI prefixes in the IEEE registry, of which 04:A9:59 is one. A device made by New H3C Technologies Co., Ltd could carry a MAC address from any of them.