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On 17 January 2011, the RIPE NCC, together with the other four RIRs and ICANN, completed the transition of the technical management function for the in-addr.arpa zone from ARIN to ICANN.
The in-addr.arpa zone was also migrated from 12 root servers to dedicated nameservers operated by the five RIRs and one operated by ICANN.
Immediately upon transfer to ICANN, the in-addr.arpa zone was signed using DNS Security Extensions (DNSSEC), providing End Users with the ability to validate answers to reverse DNS queries.
More information on the history of this transition is available at:
http://in-addr-transition.icann.org/