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Public Comment

Public Comment is a vital part of our multistakeholder model. It provides a mechanism for stakeholders to have their opinions and recommendations formally and publicly documented. It is an opportunity for the ICANN community to effect change and improve policies and operations.

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Name: MD IMRAN HOSSEN
Date: 10 Dec 2025
Email: [email protected]
Original Public Comment: Name Collision IPv6 Research Study
Other Comments

I support ICANN’s proposal to adopt ::ffff:7f00:3535 as the IPv6 address for Controlled Interruption. The study shows this address does not send outbound traffic, behaves most similarly to the existing IPv4 CI address (127.0.53.53), and maintains the recognizability needed for effective Name Collision notification. I also agree with excluding multicast and link-local options due to usability and ICMPv6 leakage concerns. Finally, ICANN and the IETF should consider pursuing a standardized IPv6 loopback prefix in the future.

Summary of Submission

This comment supports the selection of ::ffff:7f00:3535 as the IPv6 Controlled Interruption address based on the study’s findings that it is safe, non-routable, consistent with IPv4 CI behavior, and preserves the educational value of CI. The comment highlights concerns with alternative multicast and link-local options and encourages future collaboration with the IETF to define a dedicated IPv6 loopback block.