Which company owns MAC address prefix 70:30:5E?

MAC address prefix 70:30:5E is registered to Nanjing Zhongke Menglian Information Technology Co.,LTD in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 70:30:5E has a network interface built by Nanjing Zhongke Menglian Information Technology Co.,LTD.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 70:30:5E:00:00:00 that is 70:30:5E — 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.

Nanjing Zhongke Menglian Information Technology Co.,LTD

MAC address prefix 70:30:5E is registered to Nanjing Zhongke Menglian Information Technology Co.,LTD in the IEEE OUI registry. Any device whose MAC address begins with 70:30:5E has a network interface built by Nanjing Zhongke Menglian Information 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 70:30:5E:00:00:00 to 70:30:5E:FF:FF:FF.

OUI prefix: 70:30:5E
Hyphen form: 70-30-5E
MAC range: 70:30:5E:00:00:00 – 70:30:5E:FF:FF:FF
Addresses in block: 16,777,216
Organization: Nanjing Zhongke Menglian Information Technology Co.,LTD
Address: 3rd Floor,Building A,Area 3 Nanjing Jiangsu CN 210042
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 "Nanjing Zhongke Menglian Information Technology Co.,LTD"
archived source →
2026-07-17Assigned to "Nanjing Zhongke Menglian Information Technology Co.,LTD"

Nearby in the registry

The prefixes assigned immediately before and after 70:30:5E:

FAQ

Which company owns MAC address prefix 70:30:5E?: MAC address prefix 70:30:5E is registered to Nanjing Zhongke Menglian Information Technology Co.,LTD in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 70:30:5E has a network interface built by Nanjing Zhongke Menglian Information Technology Co.,LTD.
What is the OUI 70:30:5E?: 70:30:5E is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Nanjing Zhongke Menglian Information Technology Co.,LTD. It covers every address from 70:30:5E:00:00:00 to 70:30:5E:FF:FF:FF, or 16,777,216 addresses in total. It is also written 70-30-5E.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 70:30:5E:00:00:00 that is 70:30:5E — 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 Nanjing Zhongke Menglian Information Technology Co.,LTD located?: Nanjing Zhongke Menglian Information Technology Co.,LTD is listed at 3rd Floor,Building A,Area 3 Nanjing Jiangsu CN 210042 in the IEEE OUI registry entry for 70:30:5E. This is the address the organization registered with the IEEE, which may differ from its current operating address.