Lets say I own (LIR-status) the prefix 126.96.36.199/21 and that prefix is routed via AS e.g. AS12345 at this very moment.
Now I want to split this prefix into two AS, so the last portion (188.8.131.52/24) of the prefix mentioned before is routed via a new AS e.g. AS54321 and the rest is routed via the existing AS AS12345.
Is this possible?