Which company owns MAC address prefix 1C:91:79?

MAC address prefix 1C:91:79 is registered to Integrated System Technologies Ltd in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 1C:91:79 has a network interface built by Integrated System Technologies Ltd.

What is the OUI 1C:91:79?

1C:91:79 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Integrated System Technologies Ltd. It covers every address from 1C:91:79:00:00:00 to 1C:91:79:FF:FF:FF, or 16,777,216 addresses in total. It is also written 1C-91-79.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 1C:91:79:00:00:00 that is 1C:91:79 — 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 Integrated System Technologies Ltd located?

Integrated System Technologies Ltd is listed at Suite 5 Birch House Aldridge West Midlands GB WS9 0NF in the IEEE OUI registry entry for 1C:91:79. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Integrated System Technologies Ltd

MAC address prefix 1C:91:79 is registered to Integrated System Technologies Ltd in the IEEE OUI registry. Any device whose MAC address begins with 1C:91:79 has a network interface built by Integrated System Technologies 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 1C:91:79:00:00:00 to 1C:91:79:FF:FF:FF.

OUI prefix: 1C:91:79
Hyphen form: 1C-91-79
MAC range: 1C:91:79:00:00:00 – 1C:91:79:FF:FF:FF
Addresses in block: 16,777,216
Organization: Integrated System Technologies Ltd
Address: Suite 5 Birch House Aldridge West Midlands GB WS9 0NF
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.

2016-07-29Assigned to "Integrated System Technologies Ltd"
archived source →
2026-07-17Assigned to "Integrated System Technologies Ltd"

Nearby in the registry

The prefixes assigned immediately before and after 1C:91:79:

FAQ

Which company owns MAC address prefix 1C:91:79?: MAC address prefix 1C:91:79 is registered to Integrated System Technologies Ltd in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 1C:91:79 has a network interface built by Integrated System Technologies Ltd.
What is the OUI 1C:91:79?: 1C:91:79 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Integrated System Technologies Ltd. It covers every address from 1C:91:79:00:00:00 to 1C:91:79:FF:FF:FF, or 16,777,216 addresses in total. It is also written 1C-91-79.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 1C:91:79:00:00:00 that is 1C:91:79 — 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 Integrated System Technologies Ltd located?: Integrated System Technologies Ltd is listed at Suite 5 Birch House Aldridge West Midlands GB WS9 0NF in the IEEE OUI registry entry for 1C:91:79. This is the address the organization registered with the IEEE, which may differ from its current operating address.