Which company owns MAC address prefix E8:51:9D?

MAC address prefix E8:51:9D is registered to Yeonhab Precision Co.,LTD in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with E8:51:9D has a network interface built by Yeonhab Precision Co.,LTD.

What is the OUI E8:51:9D?

E8:51:9D is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Yeonhab Precision Co.,LTD. It covers every address from E8:51:9D:00:00:00 to E8:51:9D:FF:FF:FF, or 16,777,216 addresses in total. It is also written E8-51-9D.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in E8:51:9D:00:00:00 that is E8:51:9D — 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 Yeonhab Precision Co.,LTD located?

Yeonhab Precision Co.,LTD is listed at 219-27, Haksusosa-Gil, Mokcheon-Eup Cheonan Chungcheongnamdo KR 330-844 in the IEEE OUI registry entry for E8:51:9D. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Yeonhab Precision Co.,LTD

MAC address prefix E8:51:9D is registered to Yeonhab Precision Co.,LTD in the IEEE OUI registry. Any device whose MAC address begins with E8:51:9D has a network interface built by Yeonhab Precision 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 E8:51:9D:00:00:00 to E8:51:9D:FF:FF:FF.

OUI prefix: E8:51:9D
Hyphen form: E8-51-9D
MAC range: E8:51:9D:00:00:00 – E8:51:9D:FF:FF:FF
Addresses in block: 16,777,216
Organization: Yeonhab Precision Co.,LTD
Address: 219-27, Haksusosa-Gil, Mokcheon-Eup Cheonan Chungcheongnamdo KR 330-844
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 "Yeonhab Precision Co.,LTD"
archived source →
2026-07-17Assigned to "Yeonhab Precision Co.,LTD"

Nearby in the registry

The prefixes assigned immediately before and after E8:51:9D:

FAQ

Which company owns MAC address prefix E8:51:9D?: MAC address prefix E8:51:9D is registered to Yeonhab Precision Co.,LTD in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with E8:51:9D has a network interface built by Yeonhab Precision Co.,LTD.
What is the OUI E8:51:9D?: E8:51:9D is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Yeonhab Precision Co.,LTD. It covers every address from E8:51:9D:00:00:00 to E8:51:9D:FF:FF:FF, or 16,777,216 addresses in total. It is also written E8-51-9D.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in E8:51:9D:00:00:00 that is E8:51:9D — 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 Yeonhab Precision Co.,LTD located?: Yeonhab Precision Co.,LTD is listed at 219-27, Haksusosa-Gil, Mokcheon-Eup Cheonan Chungcheongnamdo KR 330-844 in the IEEE OUI registry entry for E8:51:9D. This is the address the organization registered with the IEEE, which may differ from its current operating address.