The payload ransomware group listed carlysle.net on its data leak site on 2026-03-26. Country: US Sector: Other Domains named: carlysle.net Claim as published on the leak site: Carlysle.net belongs to Carlysle Engineering, Inc., an engineering firm based in Boston. The company specializes in designing, installing, and maintaining fire protection systems such as sprinklers. They also provide building inspections and consulting services to ensure compliance with safety and insurance requirements.