Which company owns MAC address prefix 10:F3:DB?

MAC address prefix 10:F3:DB is registered to Gridco Systems, Inc. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 10:F3:DB has a network interface built by Gridco Systems, Inc..

What is the OUI 10:F3:DB?

10:F3:DB is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Gridco Systems, Inc.. It covers every address from 10:F3:DB:00:00:00 to 10:F3:DB:FF:FF:FF, or 16,777,216 addresses in total. It is also written 10-F3-DB.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 10:F3:DB:00:00:00 that is 10:F3:DB — 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 Gridco Systems, Inc. located?

Gridco Systems, Inc. is listed at 10-L Commerice Way Woburn MA US 01801 in the IEEE OUI registry entry for 10:F3:DB. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Gridco Systems, Inc.

MAC address prefix 10:F3:DB is registered to Gridco Systems, Inc. in the IEEE OUI registry. Any device whose MAC address begins with 10:F3:DB has a network interface built by Gridco 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 10:F3:DB:00:00:00 to 10:F3:DB:FF:FF:FF.

OUI prefix: 10:F3:DB
Hyphen form: 10-F3-DB
MAC range: 10:F3:DB:00:00:00 – 10:F3:DB:FF:FF:FF
Addresses in block: 16,777,216
Organization: Gridco Systems, Inc.
Address: 10-L Commerice Way Woburn MA US 01801
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 "Gridco Systems, Inc."
archived source →
2026-07-17Assigned to "Gridco Systems, Inc."

Nearby in the registry

The prefixes assigned immediately before and after 10:F3:DB:

FAQ

Which company owns MAC address prefix 10:F3:DB?: MAC address prefix 10:F3:DB is registered to Gridco Systems, Inc. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 10:F3:DB has a network interface built by Gridco Systems, Inc..
What is the OUI 10:F3:DB?: 10:F3:DB is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Gridco Systems, Inc.. It covers every address from 10:F3:DB:00:00:00 to 10:F3:DB:FF:FF:FF, or 16,777,216 addresses in total. It is also written 10-F3-DB.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 10:F3:DB:00:00:00 that is 10:F3:DB — 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 Gridco Systems, Inc. located?: Gridco Systems, Inc. is listed at 10-L Commerice Way Woburn MA US 01801 in the IEEE OUI registry entry for 10:F3:DB. This is the address the organization registered with the IEEE, which may differ from its current operating address.