Which company owns MAC address prefix 44:99:5B?

MAC address prefix 44:99:5B is registered to GX India Pvt Ltd in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 44:99:5B has a network interface built by GX India Pvt Ltd.

What is the OUI 44:99:5B?

44:99:5B is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to GX India Pvt Ltd. It covers every address from 44:99:5B:00:00:00 to 44:99:5B:FF:FF:FF, or 16,777,216 addresses in total. It is also written 44-99-5B.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 44:99:5B:00:00:00 that is 44:99:5B — 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 GX India Pvt Ltd located?

GX India Pvt Ltd is listed at 595, SECTOR-8, IMT MANESAR GURGAON Haryana IN 122051 in the IEEE OUI registry entry for 44:99:5B. This is the address the organization registered with the IEEE, which may differ from its current operating address.

How many MAC prefixes does GX India Pvt Ltd own?

GX India Pvt Ltd holds 3 OUI prefixes in the IEEE registry, of which 44:99:5B is one. A device made by GX India Pvt Ltd could carry a MAC address from any of them.

GX India Pvt Ltd

MAC address prefix 44:99:5B is registered to GX India Pvt Ltd in the IEEE OUI registry. Any device whose MAC address begins with 44:99:5B has a network interface built by GX India Pvt 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 44:99:5B:00:00:00 to 44:99:5B:FF:FF:FF.

OUI prefix: 44:99:5B
Hyphen form: 44-99-5B
MAC range: 44:99:5B:00:00:00 – 44:99:5B:FF:FF:FF
Addresses in block: 16,777,216
Organization: GX India Pvt Ltd
Address: 595, SECTOR-8, IMT MANESAR GURGAON Haryana IN 122051
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 GX India Pvt Ltd

GX India Pvt Ltd holds 3 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.

2026-06-20Assigned to "GX India Pvt Ltd"
archived source →
2026-07-17Assigned to "GX India Pvt Ltd"

Nearby in the registry

The prefixes assigned immediately before and after 44:99:5B:

FAQ

Which company owns MAC address prefix 44:99:5B?: MAC address prefix 44:99:5B is registered to GX India Pvt Ltd in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 44:99:5B has a network interface built by GX India Pvt Ltd.
What is the OUI 44:99:5B?: 44:99:5B is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to GX India Pvt Ltd. It covers every address from 44:99:5B:00:00:00 to 44:99:5B:FF:FF:FF, or 16,777,216 addresses in total. It is also written 44-99-5B.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 44:99:5B:00:00:00 that is 44:99:5B — 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 GX India Pvt Ltd located?: GX India Pvt Ltd is listed at 595, SECTOR-8, IMT MANESAR GURGAON Haryana IN 122051 in the IEEE OUI registry entry for 44:99:5B. This is the address the organization registered with the IEEE, which may differ from its current operating address.
How many MAC prefixes does GX India Pvt Ltd own?: GX India Pvt Ltd holds 3 OUI prefixes in the IEEE registry, of which 44:99:5B is one. A device made by GX India Pvt Ltd could carry a MAC address from any of them.