Ciena holds 30 MA-L blocks registered to "Ciena Corporation," 26 of them at the current address 7035 Ridge Road, Hanover, MD; the four older blocks (00-23-8A, 04-79-FD, 5C-07-A4, D4-E4-C3) carry legacy Linthicum, MD registry addresses (920 Elkridge Landing and 900 International Drive), reflecting an HQ move rather than separate entities. These OUIs appear on carrier-grade optical and packet-optical transport gear — the 6500 packet-optical platform, WDM/coherent line systems and transceivers, routing and switching, submarine-cable equipment, and the Blue Planet automation software — not consumer or enterprise LAN hardware. Ciena (NYSE: CIEN; founded 1992) sells into Tier-1/Tier-2 carriers, cloud hyperscalers, and government and submarine-cable networks, so for triage a Ciena OUI is a strong signal of service-provider or data-center transport infrastructure (often L1/optical or core packet), and seeing one outside that context is unusual and worth verifying as legitimate inventory. Because this gear sits in carrier cores and submarine paths it is high-value infrastructure; Ciena offers L1/MACsec and quantum-safe optical encryption, but no Ciena-specific product CVE was confirmed in this research pass.
- IEEE assignment
- 30 prefixes → Ciena Corporation [Confirmed] — IEEE MA-L (enrichment/registries/oui.csv)
- Registry / block size
- MA-L only (24-bit OUI); exactly 30 blocks in the local IEEE oui.csv snapshot, no MA-M or MA-S entries (none in mam.csv / oui36.csv) [Confirmed] — enrichment/registries/oui.csv, mam.csv, oui36.csv. 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" from third-party tools is a database artifact, not an IEEE fact.
- HQ / country
- 7035 Ridge Road, Hanover, MD 21076, US (current; 26 of 30 blocks). Older blocks list 900 International Drive, Linthicum, MD 21090-2200 and 920 Elkridge Landing, Linthicum, MD 21090 [Confirmed] — IEEE MA-L (enrichment/registries/oui.csv); HQ corroborated by en.wikipedia.org/wiki/Ciena
- Company status
- active; public (NYSE: CIEN), founded 1992 [Confirmed] — ciena.com/about, en.wikipedia.org/wiki/Ciena
- Device types
- optical networking / packet-optical transport (6500 series), WDM/coherent transceivers and line systems, routing and switching, submarine-cable equipment, network automation software (Blue Planet) [Confirmed] — ciena.com/products, en.wikipedia.org/wiki/Ciena
- Notable products
- 6500 packet-optical platform, WaveLogic coherent optics, Blue Planet automation
- Verified prefix sample (all MA-L, Ciena Corporation)
- 00:23:8A, 14:4E:2A, 90:DF:06, D4:B7:D0, 94:43:4D, E0:9B:27, EC:B0:E1 [Confirmed] — IEEE MA-L (enrichment/registries/oui.csv)
- Primary market segment
- Tier-1/Tier-2 telecom carriers, cloud/hyperscale operators, submarine-cable operators, government networks [Likely — single web source] — en.wikipedia.org/wiki/Ciena, ciena.com/about
- Special note
- Three address variants across the 30 blocks (current Hanover, MD plus two historical Linthicum, MD addresses) reflect an HQ move, not separate registrants — normalize to "Ciena Corporation." Carrier/optical transport gear, not consumer or LAN hardware. [Confirmed] — enrichment/registries/oui.csv
- Security context
- carrier-core and submarine-path infrastructure is a high-value target; Ciena ships L1/MACsec and quantum-safe optical encryption and publishes a security page. No Ciena-specific product CVE was confirmed in this pass (NVD search surfaced no attributed Ciena product entries); external corporate-IT hygiene notes (e.g., UpGuard) are posture observations, not product vulnerabilities. [Likely — single/secondary sources; NVD not authoritatively queried] — ciena.com/about/security, ciena.com/solutions/data-security-and-encryption, upguard.com/security-report/ciena
- OUI-to-product-line mapping
- Unknown — Ciena's official mapping article is behind the authenticated my.ciena.com portal and could not be retrieved; third-party MAC databases do not map individual prefixes to product families [Unknown] — my.ciena.com/CienaPortal/s/article/Ciena-OUI-MAC-address-ranges
- IANA Reference
- none — not applicable to a MAC OUI vendor entry [Unknown]
- Related vendors
- none major (independent)
- Analyst note
- A Ciena OUI is a strong signal of service-provider or data-center transport infrastructure (frequently L1/optical or core packet); seeing one outside that context is unusual and worth verifying as legitimate inventory.