Changes since SOA version
IXFR is a zone transfer request that returns changes since a specific SOA version. Enter the SOA version to request changes since then.
Not an apex domain
The domain 512db48a0bb56b918e1be7c4b81cc910.xlhost.com is not the root of its zone.
Instead, try zone transfer on ax-msedge.net .
Instead, try zone transfer on ax-msedge.net .