ISC is testing EDNS compliance because the lack of proper EDNS compliance impacts the deployment of new DNS features. In particular we wish to deploy DNS Cookies which requires Unknown EDNS Options to be correctly handled by all servers.
That said we are testing all of the features of EDNS as we don't know when we are going to need to use one of the other features and it is better to fix all the issues we can see sooner rather than later as delaying will only increase the amount of fixing required and will make using the other extension mechanisms less deterministic.
Test Your Servers Here
EDNS Compliance Report Time Series
Root and TLD EDNS Compliance Report
Alexa Top 1000 EDNS Compliance Report
Alexa Bottom 1000 of Top 1M EDNS Compliance Report
.GOV domains from Alexa Top 1M EDNS Compliance Report
.AU domains from Alexa Top 1M EDNS Compliance Report
CH and LI
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