Which company owns MAC address prefix 30:D9:7F?

MAC address prefix 30:D9:7F is registered to Tech4home, Lda in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 30:D9:7F has a network interface built by Tech4home, Lda.

What is the OUI 30:D9:7F?

30:D9:7F is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Tech4home, Lda. It covers every address from 30:D9:7F:00:00:00 to 30:D9:7F:FF:FF:FF, or 16,777,216 addresses in total. It is also written 30-D9-7F.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 30:D9:7F:00:00:00 that is 30:D9:7F — 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 Tech4home, Lda located?

Tech4home, Lda is listed at Rua de Fundoes N151, VAT: PT509195830 Sao Joao da Madeira Aveiro PT 3700-121 in the IEEE OUI registry entry for 30:D9:7F. This is the address the organization registered with the IEEE, which may differ from its current operating address.

How many MAC prefixes does Tech4home, Lda own?

Tech4home, Lda holds 3 OUI prefixes in the IEEE registry, of which 30:D9:7F is one. A device made by Tech4home, Lda could carry a MAC address from any of them.

Tech4home, Lda

MAC address prefix 30:D9:7F is registered to Tech4home, Lda in the IEEE OUI registry. Any device whose MAC address begins with 30:D9:7F has a network interface built by Tech4home, Lda. 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 30:D9:7F:00:00:00 to 30:D9:7F:FF:FF:FF.

OUI prefix: 30:D9:7F
Hyphen form: 30-D9-7F
MAC range: 30:D9:7F:00:00:00 – 30:D9:7F:FF:FF:FF
Addresses in block: 16,777,216
Organization: Tech4home, Lda
Address: Rua de Fundoes N151, VAT: PT509195830 Sao Joao da Madeira Aveiro PT 3700-121
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.

Other prefixes from Tech4home, Lda

Tech4home, Lda holds 3 OUI prefixes in total. A device with this exact prefix could just as well carry any of these:

Assignment history (2)

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

2024-02-15Assigned to "Tech4home, Lda"
archived source →
2026-07-17Assigned to "Tech4home, Lda"

Nearby in the registry

The prefixes assigned immediately before and after 30:D9:7F:

FAQ

Which company owns MAC address prefix 30:D9:7F?: MAC address prefix 30:D9:7F is registered to Tech4home, Lda in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 30:D9:7F has a network interface built by Tech4home, Lda.
What is the OUI 30:D9:7F?: 30:D9:7F is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Tech4home, Lda. It covers every address from 30:D9:7F:00:00:00 to 30:D9:7F:FF:FF:FF, or 16,777,216 addresses in total. It is also written 30-D9-7F.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 30:D9:7F:00:00:00 that is 30:D9:7F — 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 Tech4home, Lda located?: Tech4home, Lda is listed at Rua de Fundoes N151, VAT: PT509195830 Sao Joao da Madeira Aveiro PT 3700-121 in the IEEE OUI registry entry for 30:D9:7F. This is the address the organization registered with the IEEE, which may differ from its current operating address.
How many MAC prefixes does Tech4home, Lda own?: Tech4home, Lda holds 3 OUI prefixes in the IEEE registry, of which 30:D9:7F is one. A device made by Tech4home, Lda could carry a MAC address from any of them.