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 a176-feb9-56ff-0250-9580-4c83-07d0-2001.sta.estpak.ee is not the root of its zone.
Instead, try zone transfer on sta.estpak.ee .
Instead, try zone transfer on sta.estpak.ee .