total keys not calculating correctly when using range

[digir0n]

Using the following command to scan range 0x70000000000000000 to 0x70010000000000000
./clBitCrack.exe --keyspace 70000000000000000:70010000000000000 1BY8GQbnueYofwSuFAT3USAhGjPrkxDdW9

clBitCrack reports total keys 549743230976 after scan finnished, but this can not be correct

From 0x7000000000000000 to 0x7001000000000000.
There are 16^16 (FFFFFFFFFFFFFFFF in hexadecimal) possible values.
16^16 = 2^64 = 18,446,744,073,709,551,616

[Anwma]

I have this same confusion, can someone please answer it for me

[Anwma]

Whether the software uses some acceleration technique that reduces the number of keys to find