BITSTREAM sp. z o.o. — 78:62:99 (MA-L)

OUI 78:62:99 is a single IEEE MA-L block registered to BITSTREAM sp. z o.o., a Polish manufacturer of industrial-grade networking hardware based in Lublin (ul. Mełgiewska 7/9, 20-209). The "sp. z o.o." suffix is the Polish equivalent of a limited-liability company. The block is the standard 24-bit OUI carrying ~16.77 million (2^24) addresses, and it appears in the IEEE oui.csv MA-L list — not in the smaller MA-M or MA-S registries — which is the allocation size you would expect for an OEM shipping its own switch line rather than reselling. BitStream's hardware is built around the Hyperion managed industrial Ethernet switch family (the 105/200/300/402/500 models), alongside multiplexers, interface converters, regenerators, G.SHDSL modems, SFP transceivers, and telecom test gear engineered for harsh environments. Device-type corroboration is strong: the vendor's own product catalog maps cleanly onto the kind of Layer 2/3 networking gear that legitimately consumes a globally-administered OUI. Deployment references span critical infrastructure — energy substations (Tauron), telecom operators (Orange Polska, T-Mobile Polska), rail (Metro Warszawskie), and military communications (the Polish Armed Forces IT Support Center) — which corroborates the registrant as a real operating OEM rather than a shell. One data-quality caveat applies to dating: third-party MAC databases record "04 October 2021" for this block, but IEEE publishes no registration dates for OUI/MA-L assignments, so that value is a database artifact and is recorded as such, never as an IEEE fact. No public CVEs or security advisories were found for BitStream devices; the switches expose standard managed-switch hardening (802.1X, RADIUS, TACACS+, SNMPv3, SSH/HTTPS, optional MACsec), and the vendor references pursuit of IEC 62443 SL2 industrial-cybersecurity compliance.

IEEE assignment

78:62:99 → BITSTREAM sp. z o.o., registered Lublin, PL [Confirmed] — enrichment/registries/oui.csv line 749; https://maclookup.app/vendors/bitstream-sp-z-o-o

Registry / block size

MA-L (24-bit OUI); single block (~16.77M / 2^24 addresses) [Confirmed] — IEEE MA-L (oui.csv); not present in mam.csv (MA-M) or oui36.csv (MA-S). NOTE: IEEE's public OUI data publishes NO assignment/registration date (oui.csv columns are only Registry, Assignment, Organization Name, Organization Address); any "date registered" on third-party tools is a database artifact, not an IEEE fact.

HQ / country

ul. Mełgiewska 7/9, 20-209 Lublin, Poland [Confirmed] — IEEE MA-L registry address ("Melgiewska, 7/9, Lublin, PL 20-209"); corroborated by https://bitstream.pl/en/about-us/

Company status

active [Confirmed] — live vendor site https://bitstream.pl/en/ (founded circa 2006, ~40 employees as of 2021)

Device types

industrial managed Ethernet switches (Hyperion 105/200/300/402/500 family), active/passive multiplexers, interface converters, regenerators, G.SHDSL modems, SFP transceivers, telecom testers, control & measurement units [Confirmed] — https://bitstream.pl/en/products/switches/ ; https://bitstream.pl/en/products/hyperion-500/

Notable products

Hyperion industrial Ethernet switch family

Third-party "registration date" artifact

maclookup.app shows "04 October 2021" for 78:62:99 — this is a database artifact, NOT an IEEE-published fact, and must not be attributed to IEEE. [Confirmed as artifact] — https://maclookup.app/vendors/bitstream-sp-z-o-o

Target industries

energy/power substations, telecom operators, rail infrastructure, CCTV/IP monitoring, wind farms, intelligent transport systems, uniformed/defense services, fuel industry, industrial automation [Confirmed] — https://bitstream.pl/en/about-us/ ; https://bitstream.pl/en/products/hyperion-500/

Notable clients (registrant-legitimacy corroboration)

Tauron Polska Energia, Orange Polska, T-Mobile Polska, Multimedia Polska, Metro Warszawskie, Centrum Wsparcia Teleinformatycznego Sił Zbrojnych (Polish Armed Forces IT Support Center), Thales Polska [Confirmed] — https://bitstream.pl/en/about-us/

Security context

no public CVEs or advisories found; devices implement 802.1X, RADIUS, TACACS+/AAA, SNMPv3, HTTPS, SSH, and optional IEEE 802.1AE MACsec; vendor references IEC 62443 SL2 compliance pursuit (news item dated 2025-07-30). Critical-infrastructure deployment elevates supply-chain trust considerations but no specific exploit was found. [Confirmed] — https://bitstream.pl/en/ ; https://bitstream.pl/en/products/hyperion-500/

Analyst note

a globally-administered 78:62:99 address reliably identifies genuine BitStream hardware (typically industrial managed switches in critical-infrastructure networks); single MA-L block, so the footprint is narrow and OUI-based identification is unambiguous for this prefix.