Which company owns MAC address prefix 70:8B:78?

MAC address prefix 70:8B:78 is registered to citygrow technology co., ltd in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 70:8B:78 has a network interface built by citygrow technology co., ltd.

What is the OUI 70:8B:78?

70:8B:78 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to citygrow technology co., ltd. It covers every address from 70:8B:78:00:00:00 to 70:8B:78:FF:FF:FF, or 16,777,216 addresses in total. It is also written 70-8B-78.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 70:8B:78:00:00:00 that is 70:8B:78 — 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 citygrow technology co., ltd located?

citygrow technology co., ltd is listed at rm1404, blk A, ,5 - 21 Pak Tin Par Street Tsuen Wan HK in the IEEE OUI registry entry for 70:8B:78. This is the address the organization registered with the IEEE, which may differ from its current operating address.

citygrow technology co., ltd

MAC address prefix 70:8B:78 is registered to citygrow technology co., ltd in the IEEE OUI registry. Any device whose MAC address begins with 70:8B:78 has a network interface built by citygrow 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 70:8B:78:00:00:00 to 70:8B:78:FF:FF:FF.

OUI prefix: 70:8B:78
Hyphen form: 70-8B-78
MAC range: 70:8B:78:00:00:00 – 70:8B:78:FF:FF:FF
Addresses in block: 16,777,216
Organization: citygrow technology co., ltd
Address: rm1404, blk A, ,5 - 21 Pak Tin Par Street Tsuen Wan HK
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 "citygrow technology co., ltd"
archived source →
2026-07-17Assigned to "citygrow technology co., ltd"

Nearby in the registry

The prefixes assigned immediately before and after 70:8B:78:

FAQ

Which company owns MAC address prefix 70:8B:78?: MAC address prefix 70:8B:78 is registered to citygrow technology co., ltd in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 70:8B:78 has a network interface built by citygrow technology co., ltd.
What is the OUI 70:8B:78?: 70:8B:78 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to citygrow technology co., ltd. It covers every address from 70:8B:78:00:00:00 to 70:8B:78:FF:FF:FF, or 16,777,216 addresses in total. It is also written 70-8B-78.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 70:8B:78:00:00:00 that is 70:8B:78 — 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 citygrow technology co., ltd located?: citygrow technology co., ltd is listed at rm1404, blk A, ,5 - 21 Pak Tin Par Street Tsuen Wan HK in the IEEE OUI registry entry for 70:8B:78. This is the address the organization registered with the IEEE, which may differ from its current operating address.