OUI 90:27:78 is an IEEE MA-L block registered to "Open Infrastructure," a small Swiss open-source collective based at Neufeldstrasse 125, CH-3012 Bern, Switzerland. The project is associated with Debian Developer Daniel Baumann and publishes a family of Debian-based building blocks for professional IT infrastructure — compute-tools (systemd-nspawn container management), storage-tools, service-tools, and system-tools. Rather than shipping a single named hardware product, Open Infrastructure operates a members-only MAC sub-assignment service: it sub-leases 16-bit slices (~65,536 addresses each) of its MA-L pool to member projects. The practical consequence for asset classification is that a 90:27:78-prefixed address does not point to one OEM appliance — it may appear on virtual interfaces, systemd-nspawn containers, virtual machines, or physical Linux servers belonging to any of Open Infrastructure's diverse member organizations worldwide. An MA-L block spans roughly 16 million addresses, so the prefix identifies the pool operator, not the end device's maker. No CVEs, threat-intelligence hits, or malicious-infrastructure associations were found for the prefix or the vendor; the project is transparent, with public contact details and active Debian package maintainership, so the risk profile is low.
- IEEE assignment
- OUI 90:27:78 → Open Infrastructure [Confirmed] — IEEE MA-L (enrichment/registries/oui.csv line 445); maclookup.app (https://maclookup.app/search/result?mac=90:27:78)
- Registry / block size
- MA-L (24-bit OUI; ~16 million addresses) [Confirmed] — IEEE MA-L registry; maclookup.app (https://maclookup.app/search/result?mac=90:27:78)
- Registered address
- Neufeldstrasse 125, CH-3012 Bern, Switzerland [Confirmed] — IEEE MA-L registry; maclookup.app; vendor contact page (https://get.open-infrastructure.net/contact/)
- Country
- CH (Switzerland) [Confirmed] — IEEE MA-L registry; maclookup.app (https://maclookup.app/search/result?mac=90:27:78)
- Company status
- active [Confirmed] — vendor sites (https://web.open-infrastructure.net , https://get.open-infrastructure.net); Debian package maintainership (https://packages.debian.org/sid/admin/open-infrastructure-compute-tools)
- Assignment date
- Unknown. Third-party lookup databases (e.g. maclookup.app) display "29 July 2022", but IEEE publishes NO OUI registration dates for MA-L assignments (oui.csv columns are only Registry, Assignment, Organization Name, Organization Address). Any such date is a database artifact, not an IEEE fact — do not present it as a registration date. [Unknown] — maclookup.app (https://maclookup.app/search/result?mac=90:27:78)
- Device types
- Linux-based virtual/containerized infrastructure — systemd-nspawn containers, virtual machines, and physical compute hosts. No single named hardware appliance: the prefix functions as a pool that Open Infrastructure sub-assigns to members. [Confirmed] — vendor MAC resource page (https://web.open-infrastructure.net/resources/mac/); Debian compute-tools package (https://packages.debian.org/sid/admin/open-infrastructure-compute-tools)
- Vendor description
- Swiss open-source collective (associated with Debian Developer Daniel Baumann, Bern) producing Debian-based infrastructure building blocks — compute-tools, storage-tools, service-tools, system-tools. Holds the IEEE MA-L block and sub-assigns 65k-address slices to members. Not a commercial hardware OEM. [Confirmed] — https://web.open-infrastructure.net ; https://packages.debian.org/sid/admin/open-infrastructure-compute-tools ; https://web.daniel-baumann.ch/
- Website
- https://web.open-infrastructure.net / https://get.open-infrastructure.net [Confirmed] — vendor sites
- Special note
- MAC sub-leasing model — a single 90:27:78 prefix can cover member-owned Linux hosts globally. Treat unexpected appearances as potentially any member's virtualized/containerized Linux environment, not a single device maker. [Likely] — https://web.open-infrastructure.net/resources/mac/
- Security context
- No CVEs, threat-intelligence hits, or malicious-infrastructure associations found for OUI 90:27:78 or for Open Infrastructure. Low risk profile: transparent Swiss open-source project with public contact info and Debian package maintainership. [Likely] — https://web.open-infrastructure.net ; https://get.open-infrastructure.net/contact/
- Analyst note
- The prefix identifies the MA-L pool operator (Open Infrastructure), not the end-device manufacturer. Do not rely on it to attribute a device to a specific OEM; the sub-assignment model means the actual owner is a downstream member project.