Reverse DNS issue for some delegations in the RIPE NCC service region
Between 17:00 UTC yesterday and 10:00 UTC today, we had an issue that affected some reverse DNS delegations. Parent zones operated by ARIN and APNIC were affected.
RIPE NCC publishes zonelet files containing these delegations, and these are picked up by ARIN and APNIC's DNS provisioning system periodically. At the end of these zonelet files is a summary of the counts of various types of DNS records. A bug in some code accidentally published these summaries with zero counts, and as a result, the ARIN and APNIC DNS provisioning systems appear to have removed the delegations.
We have corrected this bug, and the zonelet files now contain the correct counts. They have been published on the RIPE NCC FTP server, and ARIN and APNIC's DNS provisioning system has picked them up and reintroduced the delegations.
We apologise for any inconvenience caused by this. This is the first time that such an issue has occurred with delegations that are exchanged by the zonelet mechanism, and we will try to engineer monitoring to prevent such an outage in the future.
The parent zones that were affected by this issue are: