Which company owns MAC address prefix 40:E9:9B?

MAC address prefix 40:E9:9B is registered to SAMSUNG ELECTRO-MECHANICS(THAILAND) in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 40:E9:9B has a network interface built by SAMSUNG ELECTRO-MECHANICS(THAILAND).

What is the OUI 40:E9:9B?

40:E9:9B is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to SAMSUNG ELECTRO-MECHANICS(THAILAND). It covers every address from 40:E9:9B:00:00:00 to 40:E9:9B:FF:FF:FF, or 16,777,216 addresses in total. It is also written 40-E9-9B.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 40:E9:9B:00:00:00 that is 40:E9:9B — 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 SAMSUNG ELECTRO-MECHANICS(THAILAND) located?

SAMSUNG ELECTRO-MECHANICS(THAILAND) is listed at 93Moo5T. Bangsamak SEMTHAI, WELLGROW INDUSTRIAL ESTATE Bangpakong Chachoengsao TH 24180 in the IEEE OUI registry entry for 40:E9:9B. This is the address the organization registered with the IEEE, which may differ from its current operating address.

How many MAC prefixes does SAMSUNG ELECTRO-MECHANICS(THAILAND) own?

SAMSUNG ELECTRO-MECHANICS(THAILAND) holds 34 OUI prefixes in the IEEE registry, of which 40:E9:9B is one. A device made by SAMSUNG ELECTRO-MECHANICS(THAILAND) could carry a MAC address from any of them.

SAMSUNG ELECTRO-MECHANICS(THAILAND)

MAC address prefix 40:E9:9B is registered to SAMSUNG ELECTRO-MECHANICS(THAILAND) in the IEEE OUI registry. Any device whose MAC address begins with 40:E9:9B has a network interface built by SAMSUNG ELECTRO-MECHANICS(THAILAND). 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 40:E9:9B:00:00:00 to 40:E9:9B:FF:FF:FF.

OUI prefix: 40:E9:9B
Hyphen form: 40-E9-9B
MAC range: 40:E9:9B:00:00:00 – 40:E9:9B:FF:FF:FF
Addresses in block: 16,777,216
Organization: SAMSUNG ELECTRO-MECHANICS(THAILAND)
Address: 93Moo5T. Bangsamak SEMTHAI, WELLGROW INDUSTRIAL ESTATE Bangpakong Chachoengsao TH 24180
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 SAMSUNG ELECTRO-MECHANICS(THAILAND)

SAMSUNG ELECTRO-MECHANICS(THAILAND) holds 34 OUI prefixes in total. A device with this exact prefix could just as well carry any of these:

Assignment history (1)

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

2026-07-17Assigned to "SAMSUNG ELECTRO-MECHANICS(THAILAND)"

Nearby in the registry

The prefixes assigned immediately before and after 40:E9:9B:

FAQ

Which company owns MAC address prefix 40:E9:9B?: MAC address prefix 40:E9:9B is registered to SAMSUNG ELECTRO-MECHANICS(THAILAND) in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 40:E9:9B has a network interface built by SAMSUNG ELECTRO-MECHANICS(THAILAND).
What is the OUI 40:E9:9B?: 40:E9:9B is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to SAMSUNG ELECTRO-MECHANICS(THAILAND). It covers every address from 40:E9:9B:00:00:00 to 40:E9:9B:FF:FF:FF, or 16,777,216 addresses in total. It is also written 40-E9-9B.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 40:E9:9B:00:00:00 that is 40:E9:9B — 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 SAMSUNG ELECTRO-MECHANICS(THAILAND) located?: SAMSUNG ELECTRO-MECHANICS(THAILAND) is listed at 93Moo5T. Bangsamak SEMTHAI, WELLGROW INDUSTRIAL ESTATE Bangpakong Chachoengsao TH 24180 in the IEEE OUI registry entry for 40:E9:9B. This is the address the organization registered with the IEEE, which may differ from its current operating address.
How many MAC prefixes does SAMSUNG ELECTRO-MECHANICS(THAILAND) own?: SAMSUNG ELECTRO-MECHANICS(THAILAND) holds 34 OUI prefixes in the IEEE registry, of which 40:E9:9B is one. A device made by SAMSUNG ELECTRO-MECHANICS(THAILAND) could carry a MAC address from any of them.