VeriSign, Inc. is a provider of domain name registry services and Internet security. The Company operates through Registry Services and Security Services segment. Registry Services ensure the security, stability and resiliency of Internet infrastructure and services, including the .com and .net domains, and operation of the root-zone maintainer functions for the core of the Internet's Domain Name System (DNS). Security Services provides infrastructure assurance services consisting of Distributed Denial of Services (DDoS) Protection Services, Verisign iDefense Security Intelligence Services (iDefense) and Managed DNS Services. DDoS Protection Services supports online business continuity by providing monitoring and mitigation services against DDoS attacks. iDefense provides access to cyber intelligence related to vulnerabilities, malicious code and global threats. Managed DNS Services is a hosting service that delivers DNS resolution for the availability of Web-based systems.