Which company owns MAC address prefix 30:5D:A6?

MAC address prefix 30:5D:A6 is registered to ADVALY SYSTEM Inc. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 30:5D:A6 has a network interface built by ADVALY SYSTEM Inc..

What is the OUI 30:5D:A6?

30:5D:A6 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to ADVALY SYSTEM Inc.. It covers every address from 30:5D:A6:00:00:00 to 30:5D:A6:FF:FF:FF, or 16,777,216 addresses in total. It is also written 30-5D-A6.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 30:5D:A6:00:00:00 that is 30:5D:A6 — 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 ADVALY SYSTEM Inc. located?

ADVALY SYSTEM Inc. is listed at 7 KITA2 NISHI2 CYUO-KU SAPPORO HOKKAIDO JP 060-0002 in the IEEE OUI registry entry for 30:5D:A6. This is the address the organization registered with the IEEE, which may differ from its current operating address.

ADVALY SYSTEM Inc.

MAC address prefix 30:5D:A6 is registered to ADVALY SYSTEM Inc. in the IEEE OUI registry. Any device whose MAC address begins with 30:5D:A6 has a network interface built by ADVALY SYSTEM 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 30:5D:A6:00:00:00 to 30:5D:A6:FF:FF:FF.

OUI prefix: 30:5D:A6
Hyphen form: 30-5D-A6
MAC range: 30:5D:A6:00:00:00 – 30:5D:A6:FF:FF:FF
Addresses in block: 16,777,216
Organization: ADVALY SYSTEM Inc.
Address: 7 KITA2 NISHI2 CYUO-KU SAPPORO HOKKAIDO JP 060-0002
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.

2018-12-21Assigned to "ADVALY SYSTEM Inc."
archived source →
2026-07-17Assigned to "ADVALY SYSTEM Inc."

Nearby in the registry

The prefixes assigned immediately before and after 30:5D:A6:

FAQ

Which company owns MAC address prefix 30:5D:A6?: MAC address prefix 30:5D:A6 is registered to ADVALY SYSTEM Inc. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 30:5D:A6 has a network interface built by ADVALY SYSTEM Inc..
What is the OUI 30:5D:A6?: 30:5D:A6 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to ADVALY SYSTEM Inc.. It covers every address from 30:5D:A6:00:00:00 to 30:5D:A6:FF:FF:FF, or 16,777,216 addresses in total. It is also written 30-5D-A6.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 30:5D:A6:00:00:00 that is 30:5D:A6 — 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 ADVALY SYSTEM Inc. located?: ADVALY SYSTEM Inc. is listed at 7 KITA2 NISHI2 CYUO-KU SAPPORO HOKKAIDO JP 060-0002 in the IEEE OUI registry entry for 30:5D:A6. This is the address the organization registered with the IEEE, which may differ from its current operating address.