Which company owns MAC address prefix 04:45:A1?

MAC address prefix 04:45:A1 is registered to NIRIT- Xinwei Telecom Technology Co., Ltd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 04:45:A1 has a network interface built by NIRIT- Xinwei Telecom Technology Co., Ltd..

What is the OUI 04:45:A1?

04:45:A1 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to NIRIT- Xinwei Telecom Technology Co., Ltd.. It covers every address from 04:45:A1:00:00:00 to 04:45:A1:FF:FF:FF, or 16,777,216 addresses in total. It is also written 04-45-A1.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 04:45:A1:00:00:00 that is 04:45:A1 — 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 NIRIT- Xinwei Telecom Technology Co., Ltd. located?

NIRIT- Xinwei Telecom Technology Co., Ltd. is listed at 2-? ??????????? ??????, ?.12, ???.2 Moscow RU 115432 in the IEEE OUI registry entry for 04:45:A1. This is the address the organization registered with the IEEE, which may differ from its current operating address.

NIRIT- Xinwei Telecom Technology Co., Ltd.

MAC address prefix 04:45:A1 is registered to NIRIT- Xinwei Telecom Technology Co., Ltd. in the IEEE OUI registry. Any device whose MAC address begins with 04:45:A1 has a network interface built by NIRIT- Xinwei Telecom 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 04:45:A1:00:00:00 to 04:45:A1:FF:FF:FF.

OUI prefix: 04:45:A1
Hyphen form: 04-45-A1
MAC range: 04:45:A1:00:00:00 – 04:45:A1:FF:FF:FF
Addresses in block: 16,777,216
Organization: NIRIT- Xinwei Telecom Technology Co., Ltd.
Address: 2-? ??????????? ??????, ?.12, ???.2 Moscow RU 115432
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.

2020-03-21Assigned to "NIRIT- Xinwei Telecom Technology Co., Ltd."
archived source →
2026-07-17Assigned to "NIRIT- Xinwei Telecom Technology Co., Ltd."

Nearby in the registry

The prefixes assigned immediately before and after 04:45:A1:

FAQ

Which company owns MAC address prefix 04:45:A1?: MAC address prefix 04:45:A1 is registered to NIRIT- Xinwei Telecom Technology Co., Ltd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 04:45:A1 has a network interface built by NIRIT- Xinwei Telecom Technology Co., Ltd..
What is the OUI 04:45:A1?: 04:45:A1 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to NIRIT- Xinwei Telecom Technology Co., Ltd.. It covers every address from 04:45:A1:00:00:00 to 04:45:A1:FF:FF:FF, or 16,777,216 addresses in total. It is also written 04-45-A1.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 04:45:A1:00:00:00 that is 04:45:A1 — 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 NIRIT- Xinwei Telecom Technology Co., Ltd. located?: NIRIT- Xinwei Telecom Technology Co., Ltd. is listed at 2-? ??????????? ??????, ?.12, ???.2 Moscow RU 115432 in the IEEE OUI registry entry for 04:45:A1. This is the address the organization registered with the IEEE, which may differ from its current operating address.