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In the code
1. I am extracting the 3rd and 4th character
2. Since the list is incremental, I am checking current number is +1 of the previous number
3. If not, I am printing all the numbers...

awk -F '.' 'NR == 1{t=substr($1,5); a=00}
{b=substr($1, 3, 2); for(i=a+1; i<b+0; i++)
printf "%02d%d\n", i, t; a=b}
END {for(i=a+1; i<=23; i++) printf "%02d%d\n", i, t}' file