We are evaluating this feature ask. However, it is not on our immediate roadmap.
Zone transfer is on our roadmap however not planned for CY 2019.
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> Do you require zone transfers in to Azure DNS, or zone transfers out? Why?
Zone transfers in to Azure DNS so it can act as a secondary DNS service.
> Do you require AXFR or IXFR?
> How should zone transfers be secured?
DNSSEC remains on our long term roadmap, however it is unlikely to be available in CY 2019. If DNSSEC is a critical and immediate requirement for your business we’d suggest that you consider evaluating 3rd party DNS hosting solutions that provide this feature.