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 138-97-141-210.reverse.cablecolor.com.sv is not the root of its zone.
Instead, try zone transfer on cablecolor.com.sv .
Instead, try zone transfer on cablecolor.com.sv .