booth-inet1--booth-inet2.citnet.caltech.edu IXFR zone transfer

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 booth-inet1--booth-inet2.citnet.caltech.edu is not the root of its zone.
Instead, try zone transfer on caltech.edu .