Which company owns MAC address prefix 78:62:99?

MAC address prefix 78:62:99 is registered to BITSTREAM sp. z o.o. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 78:62:99 has a network interface built by BITSTREAM sp. z o.o..

What is the OUI 78:62:99?

78:62:99 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to BITSTREAM sp. z o.o.. It covers every address from 78:62:99:00:00:00 to 78:62:99:FF:FF:FF, or 16,777,216 addresses in total. It is also written 78-62-99.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 78:62:99:00:00:00 that is 78:62:99 — 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 BITSTREAM sp. z o.o. located?

BITSTREAM sp. z o.o. is listed at Melgiewska, 7/9 Lublin PL 20-209 in the IEEE OUI registry entry for 78:62:99. This is the address the organization registered with the IEEE, which may differ from its current operating address.

BITSTREAM sp. z o.o.

MAC address prefix 78:62:99 is registered to BITSTREAM sp. z o.o. in the IEEE OUI registry. Any device whose MAC address begins with 78:62:99 has a network interface built by BITSTREAM sp. z o.o.. 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 78:62:99:00:00:00 to 78:62:99:FF:FF:FF.

OUI prefix: 78:62:99
Hyphen form: 78-62-99
MAC range: 78:62:99:00:00:00 – 78:62:99:FF:FF:FF
Addresses in block: 16,777,216
Organization: BITSTREAM sp. z o.o.
Address: Melgiewska, 7/9 Lublin PL 20-209
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.

2026-07-17Assigned to "BITSTREAM sp. z o.o."

Nearby in the registry

The prefixes assigned immediately before and after 78:62:99:

FAQ

Which company owns MAC address prefix 78:62:99?: MAC address prefix 78:62:99 is registered to BITSTREAM sp. z o.o. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 78:62:99 has a network interface built by BITSTREAM sp. z o.o..
What is the OUI 78:62:99?: 78:62:99 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to BITSTREAM sp. z o.o.. It covers every address from 78:62:99:00:00:00 to 78:62:99:FF:FF:FF, or 16,777,216 addresses in total. It is also written 78-62-99.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 78:62:99:00:00:00 that is 78:62:99 — 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 BITSTREAM sp. z o.o. located?: BITSTREAM sp. z o.o. is listed at Melgiewska, 7/9 Lublin PL 20-209 in the IEEE OUI registry entry for 78:62:99. This is the address the organization registered with the IEEE, which may differ from its current operating address.