Which company owns MAC address prefix 70:DA:9C?

MAC address prefix 70:DA:9C is registered to TECSEN in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 70:DA:9C has a network interface built by TECSEN.

What is the OUI 70:DA:9C?

70:DA:9C is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to TECSEN. It covers every address from 70:DA:9C:00:00:00 to 70:DA:9C:FF:FF:FF, or 16,777,216 addresses in total. It is also written 70-DA-9C.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 70:DA:9C:00:00:00 that is 70:DA:9C — 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 TECSEN located?

TECSEN is listed at $401, Jeongsu Bd, 94-70, SEOUL NA KR 150-037 in the IEEE OUI registry entry for 70:DA:9C. This is the address the organization registered with the IEEE, which may differ from its current operating address.

TECSEN

MAC address prefix 70:DA:9C is registered to TECSEN in the IEEE OUI registry. Any device whose MAC address begins with 70:DA:9C has a network interface built by TECSEN. 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:DA:9C:00:00:00 to 70:DA:9C:FF:FF:FF.

OUI prefix: 70:DA:9C
Hyphen form: 70-DA-9C
MAC range: 70:DA:9C:00:00:00 – 70:DA:9C:FF:FF:FF
Addresses in block: 16,777,216
Organization: TECSEN
Address: $401, Jeongsu Bd, 94-70, SEOUL NA KR 150-037
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 "TECSEN"
archived source →
2026-07-17Assigned to "TECSEN"

Nearby in the registry

The prefixes assigned immediately before and after 70:DA:9C:

FAQ

Which company owns MAC address prefix 70:DA:9C?: MAC address prefix 70:DA:9C is registered to TECSEN in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 70:DA:9C has a network interface built by TECSEN.
What is the OUI 70:DA:9C?: 70:DA:9C is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to TECSEN. It covers every address from 70:DA:9C:00:00:00 to 70:DA:9C:FF:FF:FF, or 16,777,216 addresses in total. It is also written 70-DA-9C.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 70:DA:9C:00:00:00 that is 70:DA:9C — 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 TECSEN located?: TECSEN is listed at $401, Jeongsu Bd, 94-70, SEOUL NA KR 150-037 in the IEEE OUI registry entry for 70:DA:9C. This is the address the organization registered with the IEEE, which may differ from its current operating address.