Which company owns MAC address prefix 04:1C:DB?

MAC address prefix 04:1C:DB is registered to Siba Service in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 04:1C:DB has a network interface built by Siba Service.

What is the OUI 04:1C:DB?

04:1C:DB is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Siba Service. It covers every address from 04:1C:DB:00:00:00 to 04:1C:DB:FF:FF:FF, or 16,777,216 addresses in total. It is also written 04-1C-DB.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 04:1C:DB:00:00:00 that is 04:1C:DB — 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 Siba Service located?

Siba Service is listed at 6F, Kobe Commerce, Industry and Trade Center Building, 5-1-14 Hamabe-dori, Chuo-ku Kobe-shi Hyogo-ken JP 6510083 in the IEEE OUI registry entry for 04:1C:DB. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Siba Service

MAC address prefix 04:1C:DB is registered to Siba Service in the IEEE OUI registry. Any device whose MAC address begins with 04:1C:DB has a network interface built by Siba Service. 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 04:1C:DB:00:00:00 to 04:1C:DB:FF:FF:FF.

OUI prefix: 04:1C:DB
Hyphen form: 04-1C-DB
MAC range: 04:1C:DB:00:00:00 – 04:1C:DB:FF:FF:FF
Addresses in block: 16,777,216
Organization: Siba Service
Address: 6F, Kobe Commerce, Industry and Trade Center Building, 5-1-14 Hamabe-dori, Chuo-ku Kobe-shi Hyogo-ken JP 6510083
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.

2026-01-08Assigned to "Siba Service"
archived source →
2026-07-17Assigned to "Siba Service"

Nearby in the registry

The prefixes assigned immediately before and after 04:1C:DB:

FAQ

Which company owns MAC address prefix 04:1C:DB?: MAC address prefix 04:1C:DB is registered to Siba Service in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 04:1C:DB has a network interface built by Siba Service.
What is the OUI 04:1C:DB?: 04:1C:DB is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Siba Service. It covers every address from 04:1C:DB:00:00:00 to 04:1C:DB:FF:FF:FF, or 16,777,216 addresses in total. It is also written 04-1C-DB.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 04:1C:DB:00:00:00 that is 04:1C:DB — 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 Siba Service located?: Siba Service is listed at 6F, Kobe Commerce, Industry and Trade Center Building, 5-1-14 Hamabe-dori, Chuo-ku Kobe-shi Hyogo-ken JP 6510083 in the IEEE OUI registry entry for 04:1C:DB. This is the address the organization registered with the IEEE, which may differ from its current operating address.