Which company owns MAC address prefix 18:84:10?

MAC address prefix 18:84:10 is registered to CoreTrust Inc. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 18:84:10 has a network interface built by CoreTrust Inc..

What is the OUI 18:84:10?

18:84:10 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to CoreTrust Inc.. It covers every address from 18:84:10:00:00:00 to 18:84:10:FF:FF:FF, or 16,777,216 addresses in total. It is also written 18-84-10.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 18:84:10:00:00:00 that is 18:84:10 — 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 CoreTrust Inc. located?

CoreTrust Inc. is listed at 14F Saman Bldg. 945 Daechi-dong Seoul Republic of Korea KR 135-280 in the IEEE OUI registry entry for 18:84:10. This is the address the organization registered with the IEEE, which may differ from its current operating address.

CoreTrust Inc.

MAC address prefix 18:84:10 is registered to CoreTrust Inc. in the IEEE OUI registry. Any device whose MAC address begins with 18:84:10 has a network interface built by CoreTrust 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 18:84:10:00:00:00 to 18:84:10:FF:FF:FF.

OUI prefix: 18:84:10
Hyphen form: 18-84-10
MAC range: 18:84:10:00:00:00 – 18:84:10:FF:FF:FF
Addresses in block: 16,777,216
Organization: CoreTrust Inc.
Address: 14F Saman Bldg. 945 Daechi-dong Seoul Republic of Korea KR 135-280
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.

2016-07-29Assigned to "CoreTrust Inc."
archived source →
2026-07-17Assigned to "CoreTrust Inc."

Nearby in the registry

The prefixes assigned immediately before and after 18:84:10:

FAQ

Which company owns MAC address prefix 18:84:10?: MAC address prefix 18:84:10 is registered to CoreTrust Inc. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 18:84:10 has a network interface built by CoreTrust Inc..
What is the OUI 18:84:10?: 18:84:10 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to CoreTrust Inc.. It covers every address from 18:84:10:00:00:00 to 18:84:10:FF:FF:FF, or 16,777,216 addresses in total. It is also written 18-84-10.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 18:84:10:00:00:00 that is 18:84:10 — 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 CoreTrust Inc. located?: CoreTrust Inc. is listed at 14F Saman Bldg. 945 Daechi-dong Seoul Republic of Korea KR 135-280 in the IEEE OUI registry entry for 18:84:10. This is the address the organization registered with the IEEE, which may differ from its current operating address.