Which company owns MAC address prefix EC:22:57?

MAC address prefix EC:22:57 is registered to JiangSu NanJing University Electronic Information Technology Co.,Ltd in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with EC:22:57 has a network interface built by JiangSu NanJing University Electronic Information Technology Co.,Ltd.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in EC:22:57:00:00:00 that is EC:22:57 — 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.

JiangSu NanJing University Electronic Information Technology Co.,Ltd

MAC address prefix EC:22:57 is registered to JiangSu NanJing University Electronic Information Technology Co.,Ltd in the IEEE OUI registry. Any device whose MAC address begins with EC:22:57 has a network interface built by JiangSu NanJing University Electronic 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 EC:22:57:00:00:00 to EC:22:57:FF:FF:FF.

OUI prefix: EC:22:57
Hyphen form: EC-22-57
MAC range: EC:22:57:00:00:00 – EC:22:57:FF:FF:FF
Addresses in block: 16,777,216
Organization: JiangSu NanJing University Electronic Information Technology Co.,Ltd
Address: F7,Block 06 NanJing JiangSu CN 210000
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 "JiangSu NanJing University Electronic Information Technology Co.,Ltd"
archived source →
2026-07-17Assigned to "JiangSu NanJing University Electronic Information Technology Co.,Ltd"

Nearby in the registry

The prefixes assigned immediately before and after EC:22:57:

FAQ

Which company owns MAC address prefix EC:22:57?: MAC address prefix EC:22:57 is registered to JiangSu NanJing University Electronic Information Technology Co.,Ltd in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with EC:22:57 has a network interface built by JiangSu NanJing University Electronic Information Technology Co.,Ltd.
What is the OUI EC:22:57?: EC:22:57 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to JiangSu NanJing University Electronic Information Technology Co.,Ltd. It covers every address from EC:22:57:00:00:00 to EC:22:57:FF:FF:FF, or 16,777,216 addresses in total. It is also written EC-22-57.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in EC:22:57:00:00:00 that is EC:22:57 — 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 JiangSu NanJing University Electronic Information Technology Co.,Ltd located?: JiangSu NanJing University Electronic Information Technology Co.,Ltd is listed at F7,Block 06 NanJing JiangSu CN 210000 in the IEEE OUI registry entry for EC:22:57. This is the address the organization registered with the IEEE, which may differ from its current operating address.