Just to add some details, the problem is related to the
between telecom.co.nz and spark.co.nz. When a cache tries to
telecom.co.nz, because the absence of glue records in the parent zone
(co.nz), it >will try to resolve spark.co.nz, which to be completed needs to
resolve telecom.co.nz. Without a hint, there is no way to bootstrap the
resolution process, so it fails.
It's up to Telecom to have it fixed, hopefully it will be done sometime
It's quite an impressive balls up to be frank. I am assuming this will have
a flow on effect for other Telecom hosted sites as well.