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DNS is a critical component of the Internet. It maps domain names to IP addresses and serves as a distributed database for various other applications, including mail, Web, and spam filtering. This paper examines DNS zones in the Internet for diversity, adoption rates of new technologies, and prevalence of configuration issues. To gather data, the authors sweep 60% of the Internet's domains in June-August 2007 for zone transfers. 6.6% of them allow them to transfer their complete information. Surprisingly, this includes a large fraction of the domains deploying DNSSEC. They find that DNS zones vary significantly in size and some span many ASes. Also, while antispam technologies appear to be getting deployed, the adoption rates of DNSSEC and IPv6 continue to be low.
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