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 31-38-241.wireless.csail.mit.edu is not the root of its zone.
Instead, try zone transfer on wireless.csail.mit.edu .
Instead, try zone transfer on wireless.csail.mit.edu .