Which company owns MAC address prefix EC:84:39?

MAC address prefix EC:84:39 is registered to BITMAIN DEVELOPMENT PTE. LTD. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with EC:84:39 has a network interface built by BITMAIN DEVELOPMENT PTE. LTD..

What is the OUI EC:84:39?

EC:84:39 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to BITMAIN DEVELOPMENT PTE. LTD.. It covers every address from EC:84:39:00:00:00 to EC:84:39:FF:FF:FF, or 16,777,216 addresses in total. It is also written EC-84-39.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in EC:84:39:00:00:00 that is EC:84:39 — 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.

BITMAIN DEVELOPMENT PTE. LTD.

MAC address prefix EC:84:39 is registered to BITMAIN DEVELOPMENT PTE. LTD. in the IEEE OUI registry. Any device whose MAC address begins with EC:84:39 has a network interface built by BITMAIN DEVELOPMENT PTE. 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 EC:84:39:00:00:00 to EC:84:39:FF:FF:FF.

OUI prefix: EC:84:39
Hyphen form: EC-84-39
MAC range: EC:84:39:00:00:00 – EC:84:39:FF:FF:FF
Addresses in block: 16,777,216
Organization: BITMAIN DEVELOPMENT PTE. LTD.
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 (3)

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

2025-05-13Assigned to "Private"
archived source →
2026-06-20Renamed from "Private" to "BITMAIN DEVELOPMENT PTE. LTD."
archived source →
2026-07-17Assigned to "BITMAIN DEVELOPMENT PTE. LTD."

Nearby in the registry

The prefixes assigned immediately before and after EC:84:39:

FAQ

Which company owns MAC address prefix EC:84:39?: MAC address prefix EC:84:39 is registered to BITMAIN DEVELOPMENT PTE. LTD. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with EC:84:39 has a network interface built by BITMAIN DEVELOPMENT PTE. LTD..
What is the OUI EC:84:39?: EC:84:39 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to BITMAIN DEVELOPMENT PTE. LTD.. It covers every address from EC:84:39:00:00:00 to EC:84:39:FF:FF:FF, or 16,777,216 addresses in total. It is also written EC-84-39.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in EC:84:39:00:00:00 that is EC:84:39 — 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.