6477c3e9ec96f50cf51baa48e8576c20.4a167dbf8487af835e8e24af81ffc04b.715334903.sectigo.com 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 6477c3e9ec96f50cf51baa48e8576c20.4a167dbf8487af835e8e24af81ffc04b.715334903.sectigo.com is not the root of its zone.
Instead, try zone transfer on sectigo.com .