Which company owns MAC address prefix 78:30:F5?

MAC address prefix 78:30:F5 is registered to TBT Inc. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 78:30:F5 has a network interface built by TBT Inc..

What is the OUI 78:30:F5?

78:30:F5 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to TBT Inc.. It covers every address from 78:30:F5:00:00:00 to 78:30:F5:FF:FF:FF, or 16,777,216 addresses in total. It is also written 78-30-F5.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 78:30:F5:00:00:00 that is 78:30:F5 — 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 TBT Inc. located?

TBT Inc. is listed at 10, Seounsandan-ro-4gil, Gyeyang-gu Incheon KR 21072 in the IEEE OUI registry entry for 78:30:F5. This is the address the organization registered with the IEEE, which may differ from its current operating address.

TBT Inc.

MAC address prefix 78:30:F5 is registered to TBT Inc. in the IEEE OUI registry. Any device whose MAC address begins with 78:30:F5 has a network interface built by TBT Inc.. 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 78:30:F5:00:00:00 to 78:30:F5:FF:FF:FF.

OUI prefix: 78:30:F5
Hyphen form: 78-30-F5
MAC range: 78:30:F5:00:00:00 – 78:30:F5:FF:FF:FF
Addresses in block: 16,777,216
Organization: TBT Inc.
Address: 10, Seounsandan-ro-4gil, Gyeyang-gu Incheon KR 21072
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.

2023-07-11Assigned to "TBT Inc."
archived source →
2026-07-17Assigned to "TBT Inc."

Nearby in the registry

The prefixes assigned immediately before and after 78:30:F5:

FAQ

Which company owns MAC address prefix 78:30:F5?: MAC address prefix 78:30:F5 is registered to TBT Inc. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 78:30:F5 has a network interface built by TBT Inc..
What is the OUI 78:30:F5?: 78:30:F5 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to TBT Inc.. It covers every address from 78:30:F5:00:00:00 to 78:30:F5:FF:FF:FF, or 16,777,216 addresses in total. It is also written 78-30-F5.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 78:30:F5:00:00:00 that is 78:30:F5 — 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 TBT Inc. located?: TBT Inc. is listed at 10, Seounsandan-ro-4gil, Gyeyang-gu Incheon KR 21072 in the IEEE OUI registry entry for 78:30:F5. This is the address the organization registered with the IEEE, which may differ from its current operating address.