Qolsys Inc. MAC address blocks

The IEEE registry carries 2 blocks registered to Qolsys Inc., together 33.6 million addresses, first observed 14 Mar 2015, most recently 30 May 2025.

Registered in US.

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
18:C1:E2	MA-L	16.8 million	US	30 May 2025
3C:31:78	MA-L	16.8 million	US	14 Mar 2015

Every block registered to Qolsys Inc. 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.