Which company owns MAC address prefix FC:1D:59?

MAC address prefix FC:1D:59 is registered to I Smart Cities HK Ltd in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with FC:1D:59 has a network interface built by I Smart Cities HK Ltd.

What is the OUI FC:1D:59?

FC:1D:59 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to I Smart Cities HK Ltd. It covers every address from FC:1D:59:00:00:00 to FC:1D:59:FF:FF:FF, or 16,777,216 addresses in total. It is also written FC-1D-59.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in FC:1D:59:00:00:00 that is FC:1D:59 — 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 I Smart Cities HK Ltd located?

I Smart Cities HK Ltd is listed at Unit G,10/F,Phase 2,Yip Fat IND HK 73-75 in the IEEE OUI registry entry for FC:1D:59. This is the address the organization registered with the IEEE, which may differ from its current operating address.

I Smart Cities HK Ltd

MAC address prefix FC:1D:59 is registered to I Smart Cities HK Ltd in the IEEE OUI registry. Any device whose MAC address begins with FC:1D:59 has a network interface built by I Smart Cities HK 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 FC:1D:59:00:00:00 to FC:1D:59:FF:FF:FF.

OUI prefix: FC:1D:59
Hyphen form: FC-1D-59
MAC range: FC:1D:59:00:00:00 – FC:1D:59:FF:FF:FF
Addresses in block: 16,777,216
Organization: I Smart Cities HK Ltd
Address: Unit G,10/F,Phase 2,Yip Fat IND HK 73-75
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 "I Smart Cities HK Ltd"
archived source →
2026-07-17Assigned to "I Smart Cities HK Ltd"

Nearby in the registry

The prefixes assigned immediately before and after FC:1D:59:

FAQ

Which company owns MAC address prefix FC:1D:59?: MAC address prefix FC:1D:59 is registered to I Smart Cities HK Ltd in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with FC:1D:59 has a network interface built by I Smart Cities HK Ltd.
What is the OUI FC:1D:59?: FC:1D:59 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to I Smart Cities HK Ltd. It covers every address from FC:1D:59:00:00:00 to FC:1D:59:FF:FF:FF, or 16,777,216 addresses in total. It is also written FC-1D-59.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in FC:1D:59:00:00:00 that is FC:1D:59 — 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 I Smart Cities HK Ltd located?: I Smart Cities HK Ltd is listed at Unit G,10/F,Phase 2,Yip Fat IND HK 73-75 in the IEEE OUI registry entry for FC:1D:59. This is the address the organization registered with the IEEE, which may differ from its current operating address.