Which company owns MAC address prefix 48:7A:FF?

MAC address prefix 48:7A:FF is registered to ESSYS in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 48:7A:FF has a network interface built by ESSYS.

What is the OUI 48:7A:FF?

48:7A:FF is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to ESSYS. It covers every address from 48:7A:FF:00:00:00 to 48:7A:FF:FF:FF:FF, or 16,777,216 addresses in total. It is also written 48-7A-FF.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 48:7A:FF:00:00:00 that is 48:7A:FF — 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 ESSYS located?

ESSYS is listed at gaetbeol-ro Incheon KR 21999 in the IEEE OUI registry entry for 48:7A:FF. This is the address the organization registered with the IEEE, which may differ from its current operating address.

How many MAC prefixes does ESSYS own?

ESSYS holds 5 OUI prefixes in the IEEE registry, of which 48:7A:FF is one. A device made by ESSYS could carry a MAC address from any of them.

ESSYS

MAC address prefix 48:7A:FF is registered to ESSYS in the IEEE OUI registry. Any device whose MAC address begins with 48:7A:FF has a network interface built by ESSYS. 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 48:7A:FF:00:00:00 to 48:7A:FF:FF:FF:FF.

OUI prefix: 48:7A:FF
Hyphen form: 48-7A-FF
MAC range: 48:7A:FF:00:00:00 – 48:7A:FF:FF:FF:FF
Addresses in block: 16,777,216
Organization: ESSYS
Address: gaetbeol-ro Incheon KR 21999
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 ESSYS

ESSYS holds 5 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.

2020-03-21Assigned to "ESSYS"
archived source →
2026-07-17Assigned to "ESSYS"

Nearby in the registry

The prefixes assigned immediately before and after 48:7A:FF:

FAQ

Which company owns MAC address prefix 48:7A:FF?: MAC address prefix 48:7A:FF is registered to ESSYS in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 48:7A:FF has a network interface built by ESSYS.
What is the OUI 48:7A:FF?: 48:7A:FF is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to ESSYS. It covers every address from 48:7A:FF:00:00:00 to 48:7A:FF:FF:FF:FF, or 16,777,216 addresses in total. It is also written 48-7A-FF.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 48:7A:FF:00:00:00 that is 48:7A:FF — 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 ESSYS located?: ESSYS is listed at gaetbeol-ro Incheon KR 21999 in the IEEE OUI registry entry for 48:7A:FF. This is the address the organization registered with the IEEE, which may differ from its current operating address.
How many MAC prefixes does ESSYS own?: ESSYS holds 5 OUI prefixes in the IEEE registry, of which 48:7A:FF is one. A device made by ESSYS could carry a MAC address from any of them.