S.E.I. CO.,LTD. MAC address blocks

The IEEE registry carries 4 blocks registered to S.E.I. CO.,LTD., together 16.4 thousand addresses, first observed 16 Apr 2017, most recently 28 Jun 2025.

Registered in JP.

Cumulative address space by first-observed date on a linear scale sized to this chart; hover for date and total.

Prefix	Block	Addresses	Country	First registered
70:B3:D5:12:D	MA-S	4.1 thousand	JP	4 Oct 2019
70:B3:D5:56:B	MA-S	4.1 thousand	JP	16 Apr 2017
8C:1F:64:65:5	MA-S	4.1 thousand	JP	20 Nov 2021
8C:1F:64:C0:9	MA-S	4.1 thousand	JP	28 Jun 2025

Every block registered to S.E.I. CO.,LTD. in the IEEE registries, complete. Free-text search also matches former owners.

Complete as of the current IEEE registry deploy. Dates are when each registration was first observed in public data, not legal assignment dates.