MAC address DC:21:B9: manufacturer Sentec Co.Ltd
Monitore os PCs da sua empresa em tempo real, com dados objetivos.
Testar grátis 14 dias →The MAC address DC:21:B9 (or DC21B9, without separators) identifies a device made by Sentec Co.Ltd. Here is what that means and how to recognize devices on your network.
Who owns the MAC starting with DC:21:B9?
The first three blocks of a MAC address form the OUI (Organizationally Unique Identifier), a code the IEEE assigns to each manufacturer. The prefix DC:21:B9 is registered to Sentec Co.Ltd. Any device whose MAC starts with DC:21:B9 (for example, DC:21:B9:1A:2B:3C) was made by this company.
What it means to see this device on your network
Knowing the manufacturer helps identify what is connected to your Wi-Fi or company network. A Sentec Co.Ltd MAC you don't recognize could be a legitimate device (a phone, a TV, a camera) — or one that shouldn't be there.
How to see every device and vendor on your network
Looking up one MAC vendor at a time is tedious. Sentinela, by PC Monitor, automatically maps every device on your network, shows each one's vendor by MAC and flags suspicious devices and connections — running on your Windows. Meet Sentinela.
Prefere falar com a gente antes de instalar?
Deixe seus dados e um especialista mostra, no seu contexto, como o PC Monitor ajuda a resolver isso na sua empresa. Sem compromisso.
Perguntas frequentes
Who owns MAC address DC:21:B9?
The prefix DC:21:B9 (DC21B9) is registered with the IEEE to Sentec Co.Ltd.
What is the OUI of a MAC address?
It is the first three blocks of the MAC (6 hex digits), which the IEEE assigns to each manufacturer.
Is every DC:21:B9 MAC from Sentec Co.Ltd?
Yes. Any MAC starting with DC:21:B9 was assigned to Sentec Co.Ltd by the IEEE, though the final product may be sold under another brand.