RUIYI(HK)TELECOMMUNICATION TECHNOLOGIES LIMITED
MAC address prefix 58:DF:A5 is registered to RUIYI(HK)TELECOMMUNICATION TECHNOLOGIES LIMITED in the IEEE OUI registry. Any device whose MAC address begins with 58:DF:A5 has a network interface built by RUIYI(HK)TELECOMMUNICATION TECHNOLOGIES LIMITED. 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 58:DF:A5:00:00:00 to 58:DF:A5:FF:FF:FF.
- OUI prefix
- 58:DF:A5
- Hyphen form
- 58-DF-A5
- MAC range
- 58:DF:A5:00:00:00 – 58:DF:A5:FF:FF:FF
- Addresses in block
- 16,777,216
- Organization
- RUIYI(HK)TELECOMMUNICATION TECHNOLOGIES LIMITED
- Address
- Room 2008,20F,Landmark North,39 Lung Sum Avenue Sheung Shui Hongkong HK 223900
- 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 (1)
The IEEE registry publishes current state only — this is the change record we've kept since we started tracking it daily.
- 2026-10-03Assigned to "RUIYI(HK)TELECOMMUNICATION TECHNOLOGIES LIMITED"
Nearby in the registry
The prefixes assigned immediately before and after 58:DF:A5:
- Quectel Wireless Solutions Co.,Ltd.58:DB:09
- TECNO MOBILE LIMITED58:DB:15
- Fast Co., Ltd.58:DB:8D
- Exceptional Innovation, Inc.58:DC:6D
- Cisco Systems, Inc58:DF:59
- Private58:DF:70
- Micro Technic A/S58:E0:2C
- Ying Hua Information Technology (Shanghai)Co., LTD58:E1:6C
- Apple, Inc.58:E2:8F
- Compass Technologies Inc.58:E3:26
- Interroll Software & Electronics GmbH58:E3:59
- WNC Corporation58:E4:03
FAQ
- Which company owns MAC address prefix 58:DF:A5?
- MAC address prefix 58:DF:A5 is registered to RUIYI(HK)TELECOMMUNICATION TECHNOLOGIES LIMITED in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 58:DF:A5 has a network interface built by RUIYI(HK)TELECOMMUNICATION TECHNOLOGIES LIMITED.
- What is the OUI 58:DF:A5?
- 58:DF:A5 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to RUIYI(HK)TELECOMMUNICATION TECHNOLOGIES LIMITED. It covers every address from 58:DF:A5:00:00:00 to 58:DF:A5:FF:FF:FF, or 16,777,216 addresses in total. It is also written 58-DF-A5.
- How do I find the manufacturer of a MAC address?
- Take the first three octets of the address — in 58:DF:A5:00:00:00 that is 58:DF:A5 — 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 RUIYI(HK)TELECOMMUNICATION TECHNOLOGIES LIMITED located?
- RUIYI(HK)TELECOMMUNICATION TECHNOLOGIES LIMITED is listed at Room 2008,20F,Landmark North,39 Lung Sum Avenue Sheung Shui Hongkong HK 223900 in the IEEE OUI registry entry for 58:DF:A5. This is the address the organization registered with the IEEE, which may differ from its current operating address.