Which company owns MAC address prefix DC:ED:84?

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

What is the OUI DC:ED:84?

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

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in DC:ED:84:00:00:00 that is DC:ED:84 — 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 Haverford Systems Inc located?

Haverford Systems Inc is listed at 152 Robbins Road Downingtown PA US 19335 in the IEEE OUI registry entry for DC:ED:84. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Haverford Systems Inc

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

OUI prefix: DC:ED:84
Hyphen form: DC-ED-84
MAC range: DC:ED:84:00:00:00 – DC:ED:84:FF:FF:FF
Addresses in block: 16,777,216
Organization: Haverford Systems Inc
Address: 152 Robbins Road Downingtown PA US 19335
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.

2018-12-21Assigned to "Haverford Systems Inc"
archived source →
2026-07-17Assigned to "Haverford Systems Inc"

Nearby in the registry

The prefixes assigned immediately before and after DC:ED:84:

FAQ

Which company owns MAC address prefix DC:ED:84?: MAC address prefix DC:ED:84 is registered to Haverford Systems Inc in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with DC:ED:84 has a network interface built by Haverford Systems Inc.
What is the OUI DC:ED:84?: DC:ED:84 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Haverford Systems Inc. It covers every address from DC:ED:84:00:00:00 to DC:ED:84:FF:FF:FF, or 16,777,216 addresses in total. It is also written DC-ED-84.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in DC:ED:84:00:00:00 that is DC:ED:84 — 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 Haverford Systems Inc located?: Haverford Systems Inc is listed at 152 Robbins Road Downingtown PA US 19335 in the IEEE OUI registry entry for DC:ED:84. This is the address the organization registered with the IEEE, which may differ from its current operating address.