Which company owns MAC address prefix 34:F8:90?

MAC address prefix 34:F8:90 is registered to Nanjing RISC-V Institute Co., Ltd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 34:F8:90 has a network interface built by Nanjing RISC-V Institute Co., Ltd..

What is the OUI 34:F8:90?

34:F8:90 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Nanjing RISC-V Institute Co., Ltd.. It covers every address from 34:F8:90:00:00:00 to 34:F8:90:FF:FF:FF, or 16,777,216 addresses in total. It is also written 34-F8-90.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 34:F8:90:00:00:00 that is 34:F8:90 — 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 Nanjing RISC-V Institute Co., Ltd. located?

Nanjing RISC-V Institute Co., Ltd. is listed at Room 303, Building C, 18 Ningshuang Road Nanjing Jiangsu CN 210000 in the IEEE OUI registry entry for 34:F8:90. This is the address the organization registered with the IEEE, which may differ from its current operating address.

How many MAC prefixes does Nanjing RISC-V Institute Co., Ltd. own?

Nanjing RISC-V Institute Co., Ltd. holds 3 OUI prefixes in the IEEE registry, of which 34:F8:90 is one. A device made by Nanjing RISC-V Institute Co., Ltd. could carry a MAC address from any of them.

Nanjing RISC-V Institute Co., Ltd.

MAC address prefix 34:F8:90 is registered to Nanjing RISC-V Institute Co., Ltd. in the IEEE OUI registry. Any device whose MAC address begins with 34:F8:90 has a network interface built by Nanjing RISC-V Institute Co., Ltd.. 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 34:F8:90:00:00:00 to 34:F8:90:FF:FF:FF.

OUI prefix: 34:F8:90
Hyphen form: 34-F8-90
MAC range: 34:F8:90:00:00:00 – 34:F8:90:FF:FF:FF
Addresses in block: 16,777,216
Organization: Nanjing RISC-V Institute Co., Ltd.
Address: Room 303, Building C, 18 Ningshuang Road Nanjing Jiangsu CN 210000
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.

Other prefixes from Nanjing RISC-V Institute Co., Ltd.

Nanjing RISC-V Institute Co., Ltd. holds 3 OUI prefixes in total. A device with this exact prefix could just as well carry any of these:

Assignment history (1)

The IEEE registry publishes current state only — this is the change record we've kept since we started tracking it daily.

2026-09-03Assigned to "Nanjing RISC-V Institute Co., Ltd."

Nearby in the registry

The prefixes assigned immediately before and after 34:F8:90:

FAQ

Which company owns MAC address prefix 34:F8:90?: MAC address prefix 34:F8:90 is registered to Nanjing RISC-V Institute Co., Ltd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 34:F8:90 has a network interface built by Nanjing RISC-V Institute Co., Ltd..
What is the OUI 34:F8:90?: 34:F8:90 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Nanjing RISC-V Institute Co., Ltd.. It covers every address from 34:F8:90:00:00:00 to 34:F8:90:FF:FF:FF, or 16,777,216 addresses in total. It is also written 34-F8-90.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 34:F8:90:00:00:00 that is 34:F8:90 — 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 Nanjing RISC-V Institute Co., Ltd. located?: Nanjing RISC-V Institute Co., Ltd. is listed at Room 303, Building C, 18 Ningshuang Road Nanjing Jiangsu CN 210000 in the IEEE OUI registry entry for 34:F8:90. This is the address the organization registered with the IEEE, which may differ from its current operating address.
How many MAC prefixes does Nanjing RISC-V Institute Co., Ltd. own?: Nanjing RISC-V Institute Co., Ltd. holds 3 OUI prefixes in the IEEE registry, of which 34:F8:90 is one. A device made by Nanjing RISC-V Institute Co., Ltd. could carry a MAC address from any of them.