Which company owns MAC address prefix 00:1E:31?

MAC address prefix 00:1E:31 is registered to infomark in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 00:1E:31 has a network interface built by infomark.

What is the OUI 00:1E:31?

00:1E:31 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to infomark. It covers every address from 00:1E:31:00:00:00 to 00:1E:31:FF:FF:FF, or 16,777,216 addresses in total. It is also written 00-1E-31.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 00:1E:31:00:00:00 that is 00:1E:31 — 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 infomark located?

infomark is listed at 5F.,Geown Bldg.,1360-53 Seoul Seocho-dong,Seocho-gu KR 137-863 in the IEEE OUI registry entry for 00:1E:31. This is the address the organization registered with the IEEE, which may differ from its current operating address.

How many MAC prefixes does infomark own?

infomark holds 3 OUI prefixes in the IEEE registry, of which 00:1E:31 is one. A device made by infomark could carry a MAC address from any of them.

infomark

MAC address prefix 00:1E:31 is registered to infomark in the IEEE OUI registry. Any device whose MAC address begins with 00:1E:31 has a network interface built by infomark. 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 00:1E:31:00:00:00 to 00:1E:31:FF:FF:FF.

OUI prefix: 00:1E:31
Hyphen form: 00-1E-31
MAC range: 00:1E:31:00:00:00 – 00:1E:31:FF:FF:FF
Addresses in block: 16,777,216
Organization: infomark
Address: 5F.,Geown Bldg.,1360-53 Seoul Seocho-dong,Seocho-gu KR 137-863
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 infomark

infomark holds 3 OUI prefixes in total. A device with this exact prefix could just as well carry any of these:

Assignment history (3)

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 "INFOMARK CO.,LTD."
archived source →
2020-08-05Renamed from "INFOMARK CO.,LTD." to "infomark"
archived source →
2026-07-17Assigned to "infomark"

Nearby in the registry

The prefixes assigned immediately before and after 00:1E:31:

FAQ

Which company owns MAC address prefix 00:1E:31?: MAC address prefix 00:1E:31 is registered to infomark in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 00:1E:31 has a network interface built by infomark.
What is the OUI 00:1E:31?: 00:1E:31 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to infomark. It covers every address from 00:1E:31:00:00:00 to 00:1E:31:FF:FF:FF, or 16,777,216 addresses in total. It is also written 00-1E-31.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 00:1E:31:00:00:00 that is 00:1E:31 — 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 infomark located?: infomark is listed at 5F.,Geown Bldg.,1360-53 Seoul Seocho-dong,Seocho-gu KR 137-863 in the IEEE OUI registry entry for 00:1E:31. This is the address the organization registered with the IEEE, which may differ from its current operating address.
How many MAC prefixes does infomark own?: infomark holds 3 OUI prefixes in the IEEE registry, of which 00:1E:31 is one. A device made by infomark could carry a MAC address from any of them.