Telephonics Corporation MAC Addresses
This page provides information about MAC addresses and OUIs assigned to Telephonics Corporation. The Organizationally Unique Identifier (OUI) is the first 24 bits of a MAC address and is assigned by the IEEE to uniquely identify a vendor or manufacturer.
About Telephonics Corporation MAC Addresses
MAC addresses beginning with 00:21:A8: are manufactured by Telephonics Corporation. When you see a device on your network with this OUI prefix, it indicates that the device was manufactured by Telephonics Corporation.
The IEEE assigns OUI prefixes to manufacturers to ensure uniqueness in the global networking ecosystem. Telephonics Corporation has been assigned the OUI prefix 0021A8 (among others) for use in their network devices.
Common Telephonics Corporation Devices
Devices manufactured by Telephonics Corporation that you might encounter on networks include:
- Network interface cards (NICs)
- Routers and switches
- Wireless access points
- IoT devices
- Embedded systems
- And other networking equipment
Identifying Telephonics Corporation Devices on Your Network
To identify Telephonics Corporation devices on your network:
- Use network scanning tools to list devices on your network
- Look for MAC addresses starting with any of the OUI prefixes listed in the sidebar
- Use our MAC address lookup tool to confirm the manufacturer
This can be particularly helpful for network inventory, troubleshooting, and security auditing.
MAC Address Format
A complete MAC address consists of 48 bits (6 bytes) and is typically represented in hexadecimal format with each byte separated by a colon or a hyphen. For Telephonics Corporation devices, the MAC address would look like:
00:21:A8:XX:XX:XX
The first three bytes (00:21:A8) identify the manufacturer as Telephonics Corporation, while the last three bytes are unique to each device.