Which company owns MAC address prefix 30:9C:23?

MAC address prefix 30:9C:23 is registered to Micro-Star INTL CO., LTD. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 30:9C:23 has a network interface built by Micro-Star INTL CO., LTD..

What is the OUI 30:9C:23?

30:9C:23 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Micro-Star INTL CO., LTD.. It covers every address from 30:9C:23:00:00:00 to 30:9C:23:FF:FF:FF, or 16,777,216 addresses in total. It is also written 30-9C-23.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 30:9C:23:00:00:00 that is 30:9C:23 — 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 Micro-Star INTL CO., LTD. located?

Micro-Star INTL CO., LTD. is listed at No.69, Lide St., New Taipei City Taiwan TW 235 in the IEEE OUI registry entry for 30:9C:23. This is the address the organization registered with the IEEE, which may differ from its current operating address.

How many MAC prefixes does Micro-Star INTL CO., LTD. own?

Micro-Star INTL CO., LTD. holds 10 OUI prefixes in the IEEE registry, of which 30:9C:23 is one. A device made by Micro-Star INTL CO., LTD. could carry a MAC address from any of them.

Micro-Star INTL CO., LTD.

MAC address prefix 30:9C:23 is registered to Micro-Star INTL CO., LTD. in the IEEE OUI registry. Any device whose MAC address begins with 30:9C:23 has a network interface built by Micro-Star INTL CO., LTD.. 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 30:9C:23:00:00:00 to 30:9C:23:FF:FF:FF.

OUI prefix: 30:9C:23
Hyphen form: 30-9C-23
MAC range: 30:9C:23:00:00:00 – 30:9C:23:FF:FF:FF
Addresses in block: 16,777,216
Organization: Micro-Star INTL CO., LTD.
Address: No.69, Lide St., New Taipei City Taiwan TW 235
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 Micro-Star INTL CO., LTD.

Micro-Star INTL CO., LTD. holds 10 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.

2017-09-08Assigned to "Micro-Star INTL CO., LTD."
archived source →
2026-07-17Assigned to "Micro-Star INTL CO., LTD."

Nearby in the registry

The prefixes assigned immediately before and after 30:9C:23:

FAQ

Which company owns MAC address prefix 30:9C:23?: MAC address prefix 30:9C:23 is registered to Micro-Star INTL CO., LTD. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 30:9C:23 has a network interface built by Micro-Star INTL CO., LTD..
What is the OUI 30:9C:23?: 30:9C:23 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Micro-Star INTL CO., LTD.. It covers every address from 30:9C:23:00:00:00 to 30:9C:23:FF:FF:FF, or 16,777,216 addresses in total. It is also written 30-9C-23.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 30:9C:23:00:00:00 that is 30:9C:23 — 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 Micro-Star INTL CO., LTD. located?: Micro-Star INTL CO., LTD. is listed at No.69, Lide St., New Taipei City Taiwan TW 235 in the IEEE OUI registry entry for 30:9C:23. This is the address the organization registered with the IEEE, which may differ from its current operating address.
How many MAC prefixes does Micro-Star INTL CO., LTD. own?: Micro-Star INTL CO., LTD. holds 10 OUI prefixes in the IEEE registry, of which 30:9C:23 is one. A device made by Micro-Star INTL CO., LTD. could carry a MAC address from any of them.