Harmonic, Inc — 4 prefixes (MA-L); broadband/cable network equipment manufacturer

A MAC address beginning with one of four prefixes registered to "Harmonic, Inc" belongs to equipment made by Harmonic Inc (Nasdaq: HLIT), a publicly traded broadband/video infrastructure vendor headquartered in San Jose, California. In practice this points to cable/fiber access network hardware — cable edge devices, Distributed Access Architecture (DAA) nodes, Remote PHY devices, or optical line terminal (OLT) equipment — rather than consumer electronics.

Note on scope: the IEEE registry also contains several other, DISTINCT "Harmonic ..." organizations that are separate legal entities and are NOT part of this entry — "HARMONIC SYSTEMS INCORPORATED" (Los Altos, CA, prefix 00:60:CA), "Harmonic Video Systems Ltd." (Israel, 00:90:F0), "Harmonic Video Network" (Israel, 00:0C:A2), "HARMONIC DATA SYSTEMS, LTD." (Israel, 00:D0:C1), "Harmonic Technology Limited" (China, MA-M block 18:45:B3:60/28), "Harmonic Design GmbH" (MA-S block), and "6harmonics Inc" (Canada, AC:EE:3B). Only the four rows whose organization name is exactly "Harmonic, Inc" are grouped under this vendor slug, matching the pipeline's name-normalization rule (comma/"Inc" stripped -> "harmonic").

Harmonic, Inc is a substantive, long-running operating company, not a bare single-OUI registrant. It was founded in 1988 as Harmonic Lightwaves, reincorporated in Delaware in 1995, and has grown through acquisitions including DiviCom (2000), Omneon (2010), and Thomson Video Networks (2016). As of mid-2026 the company sold its video business to MediaKind (~$145M) and now operates as a "pure-play broadband" vendor, serving 150+ network operators worldwide (including Comcast, Charter, Mediacom, Vodafone per the company's own site) with an installed base the company states is roughly 45 million CPE devices and 50,000+ Remote PHY Devices. Three of the four registered OUI blocks share the identical current HQ address (4300 North First Street, San Jose, CA); the fourth (00:D0:28) is registered to an older Sunnyvale, CA address, consistent with a pre-relocation registration rather than an unrelated entity.

Organization name

"Harmonic, Inc" [Confirmed] — the IEEE MA-L registry

Registry / block count

MA-L (24-bit OUI); 4 distinct blocks under the identical org name "Harmonic, Inc" [Confirmed] — the IEEE MA-L registry (lines 5387, 6261, 13951, 21323)

Matching OUI assignments

00:0B:BA (line 5387, 4300 North First Street, San Jose CA), 00:20:A3 (line 6261, same address), 00:D0:28 (line 13951, 965 Stewart Drive, Sunnyvale CA — older address), 00:0A:6E (line 21323, 4300 North First Street, San Jose CA) [Confirmed] — the IEEE MA-L registry

Distinct non-matching "Harmonic ..." orgs excluded from this entry

HARMONIC SYSTEMS INCORPORATED (00:60:CA, Los Altos CA), Harmonic Video Systems Ltd. (00:90:F0, Israel), Harmonic Video Network (00:0C:A2, Israel), HARMONIC DATA SYSTEMS, LTD. (00:D0:C1, Israel), Harmonic Technology Limited (18:45:B3:60/28, MA-M, China), Harmonic Design GmbH (MA-S), 6harmonics Inc (AC:EE:3B, Canada) — each normalizes to a different slug and is a separate legal entity, not consolidated here

[Confirmed] — the IEEE MA-L registry, the IEEE MA-M registry, the Wireshark manufacturer database

Company identity

Harmonic Inc, publicly traded (Nasdaq: HLIT), HQ San Jose, CA, founded 1988 as Harmonic Lightwaves (co-founders Moshe Nazarathy and Josef Berger), reincorporated in Delaware 1995; grown via acquisitions of DiviCom (2000), Omneon (2010), Thomson Video Networks (2016)

[Confirmed] — https://en.wikipedia.org/wiki/Harmonic_Inc.

Recent corporate development

sold its video-product business to MediaKind for ~$145M (reported as of mid-2026), repositioning as a "pure-play broadband" company [Confirmed] — https://en.wikipedia.org/wiki/Harmonic_Inc., https://www.harmonicinc.com

Device/product line

cOS Broadband Platform (virtualized DOCSIS 4.0 CMTS) and cOS Central Management; DAA nodes (Oyster, Pebble, Pebble-2, Ripple, SeaStar) and centralized shelves (Reef, Wave); Remote PHY Devices; fiber/OLT equipment (Fin, Pearl, Wharf, Pier shelves) and remote switches (Jetty); company states ~45 million CPEs and 50,000+ Remote PHY Devices deployed across 150+ operators including Comcast, Charter, Mediacom, Vodafone

[Confirmed, company-stated] — https://www.harmonicinc.com

Registration date

Unknown / not applicable — IEEE publishes no assignment date for MA-L blocks; none of the 4 rows carry a date field. Any "date registered" shown by third-party MAC-lookup tools (e.g. maclookup.app-style aggregators) is a database artifact, not an IEEE fact, and is not recorded here

[Confirmed] — the IEEE MA-L registry

Security context

Unknown / incomplete check — NVD's search UI is JS-rendered and returned no static results via automated fetch, and cvedetails.com returned HTTP 403 to automated fetch; no CVE or vendor security advisory could be confirmed or ruled out for Harmonic broadband/cable hardware in this pass. This is an incomplete check, not a confirmed clean record [Unknown]

Company substance verdict

an identifiable, publicly traded (Nasdaq: HLIT), long-operating company (founded 1988) with a concrete, corroborated product line (cable/fiber broadband network equipment) and 4 independent MA-L blocks under one org name whose registered addresses track the company's known San Jose/Sunnyvale history — this is verifiable substance well beyond a bare single-OUI registration

[Confirmed] — cross-referenced registry + company site + Wikipedia

Slug-to-prefix mapping

the bare queue slug does not map to a single prefix in the registry; this entry consolidates the 4 "Harmonic, Inc" blocks under one vendor page, mirroring the multi-OUI vendor-apple / vendor-ingenico pattern; distinct "Harmonic ..." org variants are explicitly excluded (see above)

[Confirmed] — this site's own enrichment records, the IEEE MA-L registry