Arista holds about 43 MA-L blocks registered as "Arista Networks" at 5453 Great America Parkway, Santa Clara, CA (older blocks list 5470 Great America Pkwy). A slightly different registrant string, "Arista Network, Inc." (~5 blocks), exists alongside the main one and should be normalized. These OUIs appear on Arista's high-performance data-center and cloud Ethernet switches and routers — the 7000-series switches running EOS (Extensible Operating System), managed via CloudVision. Arista gear concentrates in data centers, cloud providers, and high-frequency-trading environments. For triage, an Arista OUI is a strong signal of serious data-center/cloud infrastructure (top-of-rack or spine switching); seeing one outside a data-center context is unusual and worth verifying as legitimate inventory.
- IEEE assignment
- ~43 prefixes → Arista Networks (Santa Clara, CA); ~5 → Arista Network, Inc. [Confirmed] — IEEE MA-L
- Registry / block size
- MA-L; "Arista Networks" ~43 blocks; "Arista Network, Inc." ~5 blocks [Confirmed assignments] — maclookup.app (IEEE-derived; counts are a current third-party snapshot and drift). 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
- 5453 Great America Parkway, Santa Clara, CA 95054, US (older blocks 5470 Great America Pkwy) [Confirmed] — IEEE MA-L
- Company status
- active [Confirmed] — arista.com
- Device types
- data-center/cloud Ethernet switches (high-performance), routers [Confirmed] — maclookup.app
- Notable products
- Arista 7000-series switches, EOS (Extensible Operating System), CloudVision
- Verified prefix sample
- 00:1C:73, 28:99:3A, 44:4C:A8, 74:83:EF, FC:BD:67, FC:59:C0, D4:AF:F7 [Confirmed] — maclookup.app
- Special note
- Concentrates in data centers, cloud providers, and high-frequency-trading environments. A slightly different registrant string "Arista Network, Inc." exists alongside the main "Arista Networks." [Confirmed] — maclookup.app
- Related vendors
- none major (independent)
- Analyst note
- An Arista OUI is a strong signal of serious data-center/cloud infrastructure (top-of-rack/spine switching); seeing one outside a DC context is unusual and worth verifying as legitimate inventory.