Which company owns MAC address prefix 40:D2:5F?

MAC address prefix 40:D2:5F is registered to ITEL MOBILE LIMITED in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 40:D2:5F has a network interface built by ITEL MOBILE LIMITED.

What is the OUI 40:D2:5F?

40:D2:5F is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to ITEL MOBILE LIMITED. It covers every address from 40:D2:5F:00:00:00 to 40:D2:5F:FF:FF:FF, or 16,777,216 addresses in total. It is also written 40-D2-5F.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 40:D2:5F:00:00:00 that is 40:D2:5F — 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 ITEL MOBILE LIMITED located?

ITEL MOBILE LIMITED is listed at RM B3 & B4 BLOCK B, KO FAI INDUSTRIAL BUILDING NO.7 KO FAI ROAD, YAU TONG, KLN, H.K Hong Kong KOWLOON HK 999077 in the IEEE OUI registry entry for 40:D2:5F. This is the address the organization registered with the IEEE, which may differ from its current operating address.

How many MAC prefixes does ITEL MOBILE LIMITED own?

ITEL MOBILE LIMITED holds 65 OUI prefixes in the IEEE registry, of which 40:D2:5F is one. A device made by ITEL MOBILE LIMITED could carry a MAC address from any of them.

ITEL MOBILE LIMITED

MAC address prefix 40:D2:5F is registered to ITEL MOBILE LIMITED in the IEEE OUI registry. Any device whose MAC address begins with 40:D2:5F has a network interface built by ITEL MOBILE 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 40:D2:5F:00:00:00 to 40:D2:5F:FF:FF:FF.

OUI prefix: 40:D2:5F
Hyphen form: 40-D2-5F
MAC range: 40:D2:5F:00:00:00 – 40:D2:5F:FF:FF:FF
Addresses in block: 16,777,216
Organization: ITEL MOBILE LIMITED
Address: RM B3 & B4 BLOCK B, KO FAI INDUSTRIAL BUILDING NO.7 KO FAI ROAD, YAU TONG, KLN, H.K Hong Kong KOWLOON HK 999077
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.

Other prefixes from ITEL MOBILE LIMITED

ITEL MOBILE LIMITED holds 65 OUI prefixes in total. A device with this exact prefix could just as well carry any of these:

Assignment history (2)

The IEEE registry publishes current state only — this is the change record we've kept since we started tracking it daily.

2020-08-05Assigned to "ITEL MOBILE LIMITED"
archived source →
2026-07-17Assigned to "ITEL MOBILE LIMITED"

Nearby in the registry

The prefixes assigned immediately before and after 40:D2:5F:

FAQ

Which company owns MAC address prefix 40:D2:5F?: MAC address prefix 40:D2:5F is registered to ITEL MOBILE LIMITED in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 40:D2:5F has a network interface built by ITEL MOBILE LIMITED.
What is the OUI 40:D2:5F?: 40:D2:5F is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to ITEL MOBILE LIMITED. It covers every address from 40:D2:5F:00:00:00 to 40:D2:5F:FF:FF:FF, or 16,777,216 addresses in total. It is also written 40-D2-5F.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 40:D2:5F:00:00:00 that is 40:D2:5F — 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 ITEL MOBILE LIMITED located?: ITEL MOBILE LIMITED is listed at RM B3 & B4 BLOCK B, KO FAI INDUSTRIAL BUILDING NO.7 KO FAI ROAD, YAU TONG, KLN, H.K Hong Kong KOWLOON HK 999077 in the IEEE OUI registry entry for 40:D2:5F. This is the address the organization registered with the IEEE, which may differ from its current operating address.
How many MAC prefixes does ITEL MOBILE LIMITED own?: ITEL MOBILE LIMITED holds 65 OUI prefixes in the IEEE registry, of which 40:D2:5F is one. A device made by ITEL MOBILE LIMITED could carry a MAC address from any of them.