Epson holds about 21 MA-L blocks registered as "Seiko Epson Corporation" in Nagano-ken, Japan (block addresses cluster around Shiojiri, Matsumoto, and the Suwa region). These OUIs appear on inkjet printers, EcoTank printers, MFPs, point-of-sale (POS) receipt printers, projectors, and scanners. The TM-series POS receipt printers are ubiquitous in retail, so a cluster of Epson MACs in a retail VLAN typically maps to checkout hardware. A normalization caution: multiple unrelated "Seiko" entities exist in IEEE data (Seiko Instruments Inc., Seiko Systems Inc., Seikosha), so the exact "Seiko Epson Corporation" string must be matched to avoid misattribution. For triage, Epson OUIs identify printers, projectors, or — in retail networks — POS receipt printers.
- IEEE assignment
- ~21 prefixes → Seiko Epson Corporation, registered Nagano-ken, Japan [Confirmed] — IEEE MA-L
- Registry / block size
- MA-L; ~21 blocks (~352.3M addresses); last updated 2025-10-23 (maclookup.app API 'updated' field) [Confirmed] — maclookup.app (IEEE-derived). NOTE: IEEE's public OUI data publishes NO assignment/registration date (oui.csv columns are only Registry, Assignment, Organization Name, Organization Address); any "first registered" date from third-party tools is a database artifact, not an IEEE fact.
- HQ / country
- Nagano-ken, Japan (blocks in Shiojiri, Matsumoto, Suwa region) [Confirmed] — IEEE MA-L
- Company status
- active (Seiko Epson Corporation) [Confirmed] — epson.com
- Device types
- inkjet printers, EcoTank printers, MFPs, POS receipt printers, projectors, scanners [Confirmed] — maclookup.app
- Notable products
- EcoTank, WorkForce, TM-series POS receipt printers
- Verified prefix sample
- 44:D2:44, 38:1A:52, E0:BB:9E, DC:CD:2F, A4:EE:57, 50:57:9C, 38:9D:92 [Confirmed] — maclookup.app
- Special note
- TM-series POS receipt printers are ubiquitous in retail. Multiple unrelated "Seiko" entities exist in IEEE data (Seiko Instruments Inc., Seiko Systems Inc., Seikosha) — match the exact "Seiko Epson Corporation" string to avoid misattribution. [Confirmed] — maclookup.app
- Related vendors
- Seiko group siblings (distinct IEEE registrants)
- Analyst note
- Epson OUIs identify printers, projectors, or — in retail networks — POS receipt printers; a cluster of Epson MACs in a retail VLAN typically maps to checkout hardware.