DOSarrest Internet Security Ltd. was a cybersecurity company that specialized in DDoS (Distributed Denial of Service) protection and internet security services. As of January 2021, DOSarrest was acquired by and became part of Link11 GmbH, a German cybersecurity provider headquartered in Frankfurt, Germany. Following the acquisition, all services previously offered under the DOSarrest brand — including customer support — are now managed directly by Link11. The DOSarrest website currently serves solely as a redirect and informational page pointing visitors to Link11's platform and service offerings. Link11, the parent entity, provides network security solutions with a focus on DDoS protection and cyber resilience. The company operates globally, with offices and service coverage across Germany (headquarters), the UK, and North America. Link11 offers solutions spanning DDoS mitigation, web performance, and related infrastructure protection services, targeting enterprises and organizations that require high-availability and security for their internet-facing assets. DOSarrest as an independent brand no longer operates, and its legacy customer base and technical infrastructure have been integrated into Link11's service portfolio.