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Problems with Legacy DNS

The current use and scale of the Internet has exposed several shortcomings in the functioning of the legacy DNS. We performed a large scale survey to analyze and quantify its vulnerabilities. Our survey explored the delegation chains of 593160 unique domain names collected by crawling the Yahoo! and the DMOZ.ORG web directories. These domain names belong to 535088 unique domains and are served by 164089 different nameservers. We also separately examined the 500 most popular domains as determined by the Alexa ranking service. In this section, we describe the findings of our survey, which highlight the problems in failure resilience, performance, and update propagation in the legacy DNS.