Your company needs to run BGP in a multi-homed configuration to two ISPs, advertising a...

For BGP in a multi-homed configuration advertising public IP blocks, the AS number should be a valid public AS number allocated by the regional internet registry (RIR). Numbers in the private AS range (64512–65534) are not suitable for public Internet announcements.

63472 falls in the public AS range (16-bit AS numbers below 64512).

64813, 65535, and 65218 are in the private or reserved range.

Therefore, 63472 is an example of a suitable public AS number.