Which company owns MAC address prefix 78:91:E9?

MAC address prefix 78:91:E9 is registered to Raisecom Technology CO., LTD in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 78:91:E9 has a network interface built by Raisecom Technology CO., LTD.

What is the OUI 78:91:E9?

78:91:E9 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Raisecom Technology CO., LTD. It covers every address from 78:91:E9:00:00:00 to 78:91:E9:FF:FF:FF, or 16,777,216 addresses in total. It is also written 78-91-E9.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 78:91:E9:00:00:00 that is 78:91:E9 — 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 Raisecom Technology CO., LTD located?

Raisecom Technology CO., LTD is listed at No. 11, East Area, No. 10 Block, East Xibeiwang Road Beijing CN 100094 in the IEEE OUI registry entry for 78:91:E9. This is the address the organization registered with the IEEE, which may differ from its current operating address.

How many MAC prefixes does Raisecom Technology CO., LTD own?

Raisecom Technology CO., LTD holds 14 OUI prefixes in the IEEE registry, of which 78:91:E9 is one. A device made by Raisecom Technology CO., LTD could carry a MAC address from any of them.

Raisecom Technology CO., LTD

MAC address prefix 78:91:E9 is registered to Raisecom Technology CO., LTD in the IEEE OUI registry. Any device whose MAC address begins with 78:91:E9 has a network interface built by Raisecom Technology 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 78:91:E9:00:00:00 to 78:91:E9:FF:FF:FF.

OUI prefix: 78:91:E9
Hyphen form: 78-91-E9
MAC range: 78:91:E9:00:00:00 – 78:91:E9:FF:FF:FF
Addresses in block: 16,777,216
Organization: Raisecom Technology CO., LTD
Address: No. 11, East Area, No. 10 Block, East Xibeiwang Road Beijing CN 100094
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 Raisecom Technology CO., LTD

Raisecom Technology CO., LTD holds 14 OUI prefixes in total. A device with this exact prefix could just as well carry any of these:

Assignment history (3)

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

2020-11-28Assigned to "Raisecom Technology CO.,LTD"
archived source →
2024-02-15Renamed from "Raisecom Technology CO.,LTD" to "Raisecom Technology CO., LTD"
archived source →
2026-07-17Assigned to "Raisecom Technology CO., LTD"

Nearby in the registry

The prefixes assigned immediately before and after 78:91:E9:

FAQ

Which company owns MAC address prefix 78:91:E9?: MAC address prefix 78:91:E9 is registered to Raisecom Technology CO., LTD in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 78:91:E9 has a network interface built by Raisecom Technology CO., LTD.
What is the OUI 78:91:E9?: 78:91:E9 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Raisecom Technology CO., LTD. It covers every address from 78:91:E9:00:00:00 to 78:91:E9:FF:FF:FF, or 16,777,216 addresses in total. It is also written 78-91-E9.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 78:91:E9:00:00:00 that is 78:91:E9 — 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 Raisecom Technology CO., LTD located?: Raisecom Technology CO., LTD is listed at No. 11, East Area, No. 10 Block, East Xibeiwang Road Beijing CN 100094 in the IEEE OUI registry entry for 78:91:E9. This is the address the organization registered with the IEEE, which may differ from its current operating address.
How many MAC prefixes does Raisecom Technology CO., LTD own?: Raisecom Technology CO., LTD holds 14 OUI prefixes in the IEEE registry, of which 78:91:E9 is one. A device made by Raisecom Technology CO., LTD could carry a MAC address from any of them.