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 8ctn0o5vh2lp9h3grubo29em3q8s4c6l.maxnet.org.pl is not the root of its zone.
Instead, try zone transfer on maxnet.org.pl .
Instead, try zone transfer on maxnet.org.pl .