SAC117 was published on 13 July 2021. All SSAC publications can be found at

Recommendation DescriptionCurrent Phase
Recommendation 1The SSAC reviewed many relevant publications on the topic of a root zone early warning system and provides a short summary of each in this report. The concept of an early warning system for the root zone comes originally from the Root Scaling Study Team and TNO Reports, both published in 2009. Since then the concept has evolved away from an original intention of modelling the potential impact on the operation of the root service with the addition of internationalized domain names (IDNs), IPv6, and new gTLDs to the root zone into a concept that is intended to provide feedback about the operational stability of the root service as more gTLDs are added to the root zone.

In reviewing these publications, the SSAC came to the conclusion that an early warning system for the root zone is currently infeasible, as was also concluded by OCTO-15.