Which company owns MAC address prefix 28:85:BB?

MAC address prefix 28:85:BB is registered to Zen Exim Pvt. Ltd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 28:85:BB has a network interface built by Zen Exim Pvt. Ltd..

What is the OUI 28:85:BB?

28:85:BB is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Zen Exim Pvt. Ltd.. It covers every address from 28:85:BB:00:00:00 to 28:85:BB:FF:FF:FF, or 16,777,216 addresses in total. It is also written 28-85-BB.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 28:85:BB:00:00:00 that is 28:85:BB — 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 Zen Exim Pvt. Ltd. located?

Zen Exim Pvt. Ltd. is listed at 2/4 Floor, Shakti 404, S.G.Highway, Ahmedabad Gujarat IN 380054 in the IEEE OUI registry entry for 28:85:BB. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Zen Exim Pvt. Ltd.

MAC address prefix 28:85:BB is registered to Zen Exim Pvt. Ltd. in the IEEE OUI registry. Any device whose MAC address begins with 28:85:BB has a network interface built by Zen Exim Pvt. 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 28:85:BB:00:00:00 to 28:85:BB:FF:FF:FF.

OUI prefix: 28:85:BB
Hyphen form: 28-85-BB
MAC range: 28:85:BB:00:00:00 – 28:85:BB:FF:FF:FF
Addresses in block: 16,777,216
Organization: Zen Exim Pvt. Ltd.
Address: 2/4 Floor, Shakti 404, S.G.Highway, Ahmedabad Gujarat IN 380054
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.

Assignment history (2)

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

2024-02-15Assigned to "Zen Exim Pvt. Ltd."
archived source →
2026-07-17Assigned to "Zen Exim Pvt. Ltd."

Nearby in the registry

The prefixes assigned immediately before and after 28:85:BB:

FAQ

Which company owns MAC address prefix 28:85:BB?: MAC address prefix 28:85:BB is registered to Zen Exim Pvt. Ltd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 28:85:BB has a network interface built by Zen Exim Pvt. Ltd..
What is the OUI 28:85:BB?: 28:85:BB is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Zen Exim Pvt. Ltd.. It covers every address from 28:85:BB:00:00:00 to 28:85:BB:FF:FF:FF, or 16,777,216 addresses in total. It is also written 28-85-BB.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 28:85:BB:00:00:00 that is 28:85:BB — 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 Zen Exim Pvt. Ltd. located?: Zen Exim Pvt. Ltd. is listed at 2/4 Floor, Shakti 404, S.G.Highway, Ahmedabad Gujarat IN 380054 in the IEEE OUI registry entry for 28:85:BB. This is the address the organization registered with the IEEE, which may differ from its current operating address.