Which company owns MAC address prefix 00:21:13?

MAC address prefix 00:21:13 is registered to Padtec S/A in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 00:21:13 has a network interface built by Padtec S/A.

What is the OUI 00:21:13?

00:21:13 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Padtec S/A. It covers every address from 00:21:13:00:00:00 to 00:21:13:FF:FF:FF, or 16,777,216 addresses in total. It is also written 00-21-13.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 00:21:13:00:00:00 that is 00:21:13 — 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 Padtec S/A located?

Padtec S/A is listed at Road Campinas Mogi-Mirim km 118,5 Campinas São Paulo BR 13086-902 in the IEEE OUI registry entry for 00:21:13. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Padtec S/A

MAC address prefix 00:21:13 is registered to Padtec S/A in the IEEE OUI registry. Any device whose MAC address begins with 00:21:13 has a network interface built by Padtec S/A. 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 00:21:13:00:00:00 to 00:21:13:FF:FF:FF.

OUI prefix: 00:21:13
Hyphen form: 00-21-13
MAC range: 00:21:13:00:00:00 – 00:21:13:FF:FF:FF
Addresses in block: 16,777,216
Organization: Padtec S/A
Address: Road Campinas Mogi-Mirim km 118,5 Campinas São Paulo BR 13086-902
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 "Padtec S/A"
archived source →
2026-07-17Assigned to "Padtec S/A"

Nearby in the registry

The prefixes assigned immediately before and after 00:21:13:

FAQ

Which company owns MAC address prefix 00:21:13?: MAC address prefix 00:21:13 is registered to Padtec S/A in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 00:21:13 has a network interface built by Padtec S/A.
What is the OUI 00:21:13?: 00:21:13 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Padtec S/A. It covers every address from 00:21:13:00:00:00 to 00:21:13:FF:FF:FF, or 16,777,216 addresses in total. It is also written 00-21-13.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 00:21:13:00:00:00 that is 00:21:13 — 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 Padtec S/A located?: Padtec S/A is listed at Road Campinas Mogi-Mirim km 118,5 Campinas São Paulo BR 13086-902 in the IEEE OUI registry entry for 00:21:13. This is the address the organization registered with the IEEE, which may differ from its current operating address.