Measuring the Impact of DNS Flag Day

Published: Mon 19 August 2019

DNS Flag Day was the result of a collaborative effort and agreement of DNS implementers and DNS resolver operators to commit to no longer providing workarounds for non-standards-compliant authoritative nameservers as of 1 February 2019.

In the lead up to DNS Flag Day, and as part of the outreach, the focus for measurements has been the authoritative nameservers that needed to be fixed. In this post, we will take the other perspective and look at resolvers and resolver implementations — what was resolver behaviour on the Internet before DNS Flag Day, and how does the uptake of dropping workarounds disseminate in the wild?

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