Which company owns MAC address prefix 78:D3:4F?

MAC address prefix 78:D3:4F is registered to Pace-O-Matic, Inc. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 78:D3:4F has a network interface built by Pace-O-Matic, Inc..

What is the OUI 78:D3:4F?

78:D3:4F is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Pace-O-Matic, Inc.. It covers every address from 78:D3:4F:00:00:00 to 78:D3:4F:FF:FF:FF, or 16,777,216 addresses in total. It is also written 78-D3-4F.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 78:D3:4F:00:00:00 that is 78:D3:4F — 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 Pace-O-Matic, Inc. located?

Pace-O-Matic, Inc. is listed at 4150 Blue Ridge Industrial Parkway Norcross GA US 30071 in the IEEE OUI registry entry for 78:D3:4F. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Pace-O-Matic, Inc.

MAC address prefix 78:D3:4F is registered to Pace-O-Matic, Inc. in the IEEE OUI registry. Any device whose MAC address begins with 78:D3:4F has a network interface built by Pace-O-Matic, 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 78:D3:4F:00:00:00 to 78:D3:4F:FF:FF:FF.

OUI prefix: 78:D3:4F
Hyphen form: 78-D3-4F
MAC range: 78:D3:4F:00:00:00 – 78:D3:4F:FF:FF:FF
Addresses in block: 16,777,216
Organization: Pace-O-Matic, Inc.
Address: 4150 Blue Ridge Industrial Parkway Norcross GA US 30071
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 "Pace-O-Matic, Inc."
archived source →
2026-07-17Assigned to "Pace-O-Matic, Inc."

Nearby in the registry

The prefixes assigned immediately before and after 78:D3:4F:

FAQ

Which company owns MAC address prefix 78:D3:4F?: MAC address prefix 78:D3:4F is registered to Pace-O-Matic, Inc. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 78:D3:4F has a network interface built by Pace-O-Matic, Inc..
What is the OUI 78:D3:4F?: 78:D3:4F is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Pace-O-Matic, Inc.. It covers every address from 78:D3:4F:00:00:00 to 78:D3:4F:FF:FF:FF, or 16,777,216 addresses in total. It is also written 78-D3-4F.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 78:D3:4F:00:00:00 that is 78:D3:4F — 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 Pace-O-Matic, Inc. located?: Pace-O-Matic, Inc. is listed at 4150 Blue Ridge Industrial Parkway Norcross GA US 30071 in the IEEE OUI registry entry for 78:D3:4F. This is the address the organization registered with the IEEE, which may differ from its current operating address.