DOSarrest Internet Security Ltd. was a cybersecurity company that provided DDoS protection and internet security services. As of January 2021, DOSarrest was acquired by and integrated into Link11 GmbH, a German cybersecurity provider headquartered in Frankfurt. The DOSarrest website no longer operates independently. All services previously offered under the DOSarrest brand, including customer support, are now handled directly by Link11. Existing and prospective customers are redirected to Link11's platform and contact channels for service continuity. Link11 operates globally with offices and contact points in Germany (headquarters), the UK, and North America.