Which company owns MAC address prefix D4:88:3F?

MAC address prefix D4:88:3F is registered to HDPRO CO., LTD. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with D4:88:3F has a network interface built by HDPRO CO., LTD..

What is the OUI D4:88:3F?

D4:88:3F is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to HDPRO CO., LTD.. It covers every address from D4:88:3F:00:00:00 to D4:88:3F:FF:FF:FF, or 16,777,216 addresses in total. It is also written D4-88-3F.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in D4:88:3F:00:00:00 that is D4:88:3F — 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 HDPRO CO., LTD. located?

HDPRO CO., LTD. is listed at HDPRO Bldg. 23, 362 Beon-gil, Shinheung-ro, Ojeong-gu Bucheon-City Gyunggi-Do KR 14491 in the IEEE OUI registry entry for D4:88:3F. This is the address the organization registered with the IEEE, which may differ from its current operating address.

HDPRO CO., LTD.

MAC address prefix D4:88:3F is registered to HDPRO CO., LTD. in the IEEE OUI registry. Any device whose MAC address begins with D4:88:3F has a network interface built by HDPRO 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 D4:88:3F:00:00:00 to D4:88:3F:FF:FF:FF.

OUI prefix: D4:88:3F
Hyphen form: D4-88-3F
MAC range: D4:88:3F:00:00:00 – D4:88:3F:FF:FF:FF
Addresses in block: 16,777,216
Organization: HDPRO CO., LTD.
Address: HDPRO Bldg. 23, 362 Beon-gil, Shinheung-ro, Ojeong-gu Bucheon-City Gyunggi-Do KR 14491
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 "HDPRO CO., LTD."
archived source →
2026-07-17Assigned to "HDPRO CO., LTD."

Nearby in the registry

The prefixes assigned immediately before and after D4:88:3F:

FAQ

Which company owns MAC address prefix D4:88:3F?: MAC address prefix D4:88:3F is registered to HDPRO CO., LTD. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with D4:88:3F has a network interface built by HDPRO CO., LTD..
What is the OUI D4:88:3F?: D4:88:3F is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to HDPRO CO., LTD.. It covers every address from D4:88:3F:00:00:00 to D4:88:3F:FF:FF:FF, or 16,777,216 addresses in total. It is also written D4-88-3F.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in D4:88:3F:00:00:00 that is D4:88:3F — 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 HDPRO CO., LTD. located?: HDPRO CO., LTD. is listed at HDPRO Bldg. 23, 362 Beon-gil, Shinheung-ro, Ojeong-gu Bucheon-City Gyunggi-Do KR 14491 in the IEEE OUI registry entry for D4:88:3F. This is the address the organization registered with the IEEE, which may differ from its current operating address.