Who owns MAC prefix 5C3977?

5C3977 is registered to Juniper Networks in the IEEE MA-L registry.

What devices use 5C3977?

Any network device with a MAC address starting 5C:39:77 was manufactured by or for Juniper Networks.

MA-L · OUI prefix

Juniper Networks

Any MAC address starting 5C:39:77 is registered to Juniper Networks in US.

OUI prefix	5C3977
Vendor	Juniper Networks
Registry	MA-L (24-bit, large block)
Country	US
Example MAC	5C:39:77:00:00:00

What this means

The IEEE assigned the MA-L block 5C3977 to Juniper Networks. Every network interface they manufacture under this block has a MAC address beginning with these digits, followed by a unique per-device identifier. If a device on your network shows a MAC starting 5C:39:77, it is Juniper Networks hardware.

Other Juniper Networks prefixes

Juniper Networks holds 209 registered blocks in total.

000585 0010DB 00121E 0014F6 0017CB 0019E2 001BC0 001DB5 001F12 002159 002283 00239C all 209 »

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