Which company owns MAC address prefix 70:3C:39?

MAC address prefix 70:3C:39 is registered to SEAWING Kft in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 70:3C:39 has a network interface built by SEAWING Kft.

What is the OUI 70:3C:39?

70:3C:39 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to SEAWING Kft. It covers every address from 70:3C:39:00:00:00 to 70:3C:39:FF:FF:FF, or 16,777,216 addresses in total. It is also written 70-3C-39.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 70:3C:39:00:00:00 that is 70:3C: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.

Where is SEAWING Kft located?

SEAWING Kft is listed at Palánkai utca 5. Székesfehérvár Fejér HU 8000 in the IEEE OUI registry entry for 70:3C:39. This is the address the organization registered with the IEEE, which may differ from its current operating address.

SEAWING Kft

MAC address prefix 70:3C:39 is registered to SEAWING Kft in the IEEE OUI registry. Any device whose MAC address begins with 70:3C:39 has a network interface built by SEAWING Kft. 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 70:3C:39:00:00:00 to 70:3C:39:FF:FF:FF.

OUI prefix: 70:3C:39
Hyphen form: 70-3C-39
MAC range: 70:3C:39:00:00:00 – 70:3C:39:FF:FF:FF
Addresses in block: 16,777,216
Organization: SEAWING Kft
Address: Palánkai utca 5. Székesfehérvár Fejér HU 8000
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 "SEAWING Kft"
archived source →
2026-07-17Assigned to "SEAWING Kft"

Nearby in the registry

The prefixes assigned immediately before and after 70:3C:39:

FAQ

Which company owns MAC address prefix 70:3C:39?: MAC address prefix 70:3C:39 is registered to SEAWING Kft in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 70:3C:39 has a network interface built by SEAWING Kft.
What is the OUI 70:3C:39?: 70:3C:39 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to SEAWING Kft. It covers every address from 70:3C:39:00:00:00 to 70:3C:39:FF:FF:FF, or 16,777,216 addresses in total. It is also written 70-3C-39.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 70:3C:39:00:00:00 that is 70:3C: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.
Where is SEAWING Kft located?: SEAWING Kft is listed at Palánkai utca 5. Székesfehérvár Fejér HU 8000 in the IEEE OUI registry entry for 70:3C:39. This is the address the organization registered with the IEEE, which may differ from its current operating address.