Juniper Networks MAC Addresses
This page provides information about MAC addresses and OUIs assigned to Juniper Networks. 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 Juniper Networks MAC Addresses
MAC addresses beginning with 00:21:59: are manufactured by Juniper Networks. When you see a device on your network with this OUI prefix, it indicates that the device was manufactured by Juniper Networks.
The IEEE assigns OUI prefixes to manufacturers to ensure uniqueness in the global networking ecosystem. Juniper Networks has been assigned the OUI prefix 002159 (among others) for use in their network devices.
Common Juniper Networks Devices
Devices manufactured by Juniper Networks 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 Juniper Networks Devices on Your Network
To identify Juniper Networks 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 Juniper Networks devices, the MAC address would look like:
00:21:59:XX:XX:XX
The first three bytes (00:21:59) identify the manufacturer as Juniper Networks, while the last three bytes are unique to each device.