Which company owns MAC address prefix D4:9C:53?

MAC address prefix D4:9C:53 is registered to NETCRAZE LLC in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with D4:9C:53 has a network interface built by NETCRAZE LLC.

What is the OUI D4:9C:53?

D4:9C:53 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to NETCRAZE LLC. It covers every address from D4:9C:53:00:00:00 to D4:9C:53:FF:FF:FF, or 16,777,216 addresses in total. It is also written D4-9C-53.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in D4:9C:53:00:00:00 that is D4:9C:53 — 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 NETCRAZE LLC located?

NETCRAZE LLC is listed at Ostrovityanova 11/1 Moscow RU 117437 in the IEEE OUI registry entry for D4:9C:53. This is the address the organization registered with the IEEE, which may differ from its current operating address.

NETCRAZE LLC

MAC address prefix D4:9C:53 is registered to NETCRAZE LLC in the IEEE OUI registry. Any device whose MAC address begins with D4:9C:53 has a network interface built by NETCRAZE LLC. 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 D4:9C:53:00:00:00 to D4:9C:53:FF:FF:FF.

OUI prefix: D4:9C:53
Hyphen form: D4-9C-53
MAC range: D4:9C:53:00:00:00 – D4:9C:53:FF:FF:FF
Addresses in block: 16,777,216
Organization: NETCRAZE LLC
Address: Ostrovityanova 11/1 Moscow RU 117437
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.

2025-08-23Assigned to "NETCRAZE LLC"
archived source →
2026-07-17Assigned to "NETCRAZE LLC"

Nearby in the registry

The prefixes assigned immediately before and after D4:9C:53:

FAQ

Which company owns MAC address prefix D4:9C:53?: MAC address prefix D4:9C:53 is registered to NETCRAZE LLC in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with D4:9C:53 has a network interface built by NETCRAZE LLC.
What is the OUI D4:9C:53?: D4:9C:53 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to NETCRAZE LLC. It covers every address from D4:9C:53:00:00:00 to D4:9C:53:FF:FF:FF, or 16,777,216 addresses in total. It is also written D4-9C-53.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in D4:9C:53:00:00:00 that is D4:9C:53 — 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 NETCRAZE LLC located?: NETCRAZE LLC is listed at Ostrovityanova 11/1 Moscow RU 117437 in the IEEE OUI registry entry for D4:9C:53. This is the address the organization registered with the IEEE, which may differ from its current operating address.