Network Security / DDoS Protection

• DO

  DOSarrest

  Vancouver, British Columbia, Canada (integrated into Link11 GmbH since 2021)

  DOSarrest Internet Security Ltd., founded in 2007 in Vancouver, British Columbia, carved out a reputation as a specialist in cloud-based Distributed Denial of Service (DDoS) protection. The company focused exclusively on network and application-layer DDoS mitigation, offering a fully managed, always-on service model that required no on-premises hardware. Its patent-protected platform, DataCenter Defender (DCD), leveraged a multi-layered scrubbing architecture deployed at major internet exchange points in Vancouver, New York, Los Angeles, London, Singapore, and Hong Kong. Beyond DDoS protection, DOSarrest provided a cloud-based Web Application Firewall (WAF), vulnerability testing and optimization, a cyber awareness training platform, and global load balancing. Serving clients in finance, government, utilities, gaming, and retail, the company mitigated thousands of real-world attacks. In January 2021, German cybersecurity firm Link11 GmbH acquired DOSarrest, integrating all services, support, and operations into its own global network. The DOSarrest website now redirects to Link11, and the brand lives on only in partner references, with its intellectual property absorbed into Link11's next-generation cyber resilience platform.

• 

  Corero Network Security

  London, UK

  Corero Network Security is a UK-listed technology company that specializes in automated, real-time detection and mitigation of distributed denial-of-service (DDoS) attacks. Its solutions protect service providers, hosting companies, and enterprises from increasingly sophisticated threats while ensuring digital service availability. The company's flagship SmartWall ONE platform delivers inline mitigation with sub-second response at up to 800 Gbps, combining attack detection, traffic analysis, network visibility, and reporting into a single system. Corero also offers zero-trust enforcement at the network edge and enables providers to deliver DDoS protection as a managed service. Headquartered in London, with key operational centers in Massachusetts and Edinburgh, Corero is publicly traded on the London Stock Exchange's AIM market (ticker: CNS) and the US OTCQX Market (ticker: DDOSF). In fiscal year 2025, the company reported $23.9 million in annual recurring revenue, up 23% year-over-year, with a 98% customer retention rate and an adjusted EBITDA of $1.5 million. Its solutions are deployed through strategic alliances with HPE, Juniper Networks, Akamai, and GTT.