The Domain Name System (DNS) Security Extensions (DNSSEC) introduced additional DNS records (NSEC or NSEC3 records) into negative DNS responses, which records can prove there is no translation for a queried domain name. We introduce a novel technique to estimate the size of a DNS zone by analyzing the NSEC3 records returned by only a small number of DNS queries issued. We survey the prevalence of the deployment of different variants of DNSSEC negative responses across a large set of DNSSEC-signed zones in the wild, and identify over 50% as applicable to our measurement technique. Of the applicable zones, we show that 99% are composed of fewer than 40 names.
|Talk Duration||Lightning Talk 10 Minutes|