Facebook, Inc. — 2 prefixes (MA-L)

A MAC address starting with 48:57:DD or A4:0E:2B belongs to Facebook, Inc. — the company's pre-2021-rebrand legal name — and A4:0E:2B has been traced to a discontinued Facebook Portal Mini video-calling display; 48:57:DD carries no device corroboration beyond the bare registry entry.

Both blocks are registered under the exact org-name string "Facebook Inc" (no comma) at 1 Hacker Way, Menlo Park, CA 94025, US, the company's old corporate headquarters. That is two separate MA-L allocations under one registrant, not a single-OUI shell, which is why this entry carries independent substance.

Facebook, Inc. formally became Meta Platforms, Inc. in October 2021. Meta Platforms separately holds 12 further MA-L blocks under its own post-rebrand name, documented in the sibling vendor-meta-platforms entry — those 12 prefixes are NOT part of this entry and should not be conflated with the two "Facebook Inc" blocks covered here.

The device link for A4:0E:2B comes from a Northeastern University smart-home research dataset that lists a4:0e:2b:35:11:59 under the label "facebook-portal-mini," a real (now-discontinued) Facebook video-calling product. That is third-party corroboration, not an IEEE-published product mapping, and it does not extend to 48:57:DD.

No IEEE record publishes a registration date for either block, and no malware, botnet, or abuse association was found for either prefix in general web search as of an August 2026 search — a sourced absence, not a clean-bill guarantee.

IEEE assignment

2 MA-L prefixes → "Facebook Inc" (no comma), registered Menlo Park, CA, US [Confirmed] — the IEEE MA-L registry 4857DD, the IEEE MA-L registry A40E2B

Registry / block size

MA-L (24-bit OUI) only; no MA-M (the IEEE MA-M registry) or MA-S/OUI-36 (the IEEE MA-S registry) rows found for this org name [Confirmed] — the IEEE MA-M registry, the IEEE MA-S registry

Registered address

1 Hacker Way, Menlo Park, CA 94025, US — both blocks list this address (the 4857DD row omits the state abbreviation; A40E2B's includes "CA") [Confirmed] — the IEEE MA-L registry 4857DD, the IEEE MA-L registry A40E2B

Company status

superseded — "Facebook Inc" was the corporate name prior to the October 2021 rebrand to Meta Platforms, Inc.; the OUI registrations remain on file under the old name [Confirmed] — https://about.meta.com, /mac/vendor/meta-platforms/

Verified prefixes (all MA-L, "Facebook Inc")

48:57:DD, A4:0E:2B [Confirmed] — the IEEE MA-L registry 4857DD, the IEEE MA-L registry A40E2B

Device corroboration (A4

0E:2B): matches MAC a4:0e:2b:35:11:59 labeled "facebook-portal-mini" in a Northeastern University smart-home device inventory — a discontinued Facebook Portal Mini video-calling display [Likely] — https://github.com/NEU-SNS/IoT-local/blob/main/devices.txt

Device corroboration (48

57:DD): no device-model or product corroboration found as of an August 2026 search; status is Unknown beyond the bare registry entry [Unknown] — the IEEE MA-L registry 4857DD (registry-only)

Related registrant

Meta Platforms, Inc. (2021 rebrand successor) separately holds 12 MA-L blocks under its own org-name string, not folded into this entry [Confirmed] — /mac/vendor/meta-platforms/, the IEEE MA-L registry

Registration/assignment date

Unknown / not applicable — IEEE's the IEEE MA-L registry exposes only Registry, Assignment, Organization Name, Organization Address, with no date field; third-party aggregator dates are database artifacts, not IEEE facts, and are not recorded

[Confirmed as data-availability statement] — the IEEE MA-L registry (schema), https://maclookup.app/vendors/facebook-inc

Security context

no malware, botnet, or threat-actor association recorded for either block in general web search as of an August 2026 search [Likely] — https://maclookup.app/vendors/facebook-inc

Analyst note

A4:0E:2B has third-party device corroboration on Facebook Portal Mini hardware; 48:57:DD does not and should be treated as Unknown, not silently folded into the Portal Mini claim. Do not restate Meta Platforms' 12-block figure as belonging to this "Facebook Inc" registrant — they are related but distinct registrations.