Did you pull that IP range from the server yourself or did the ISP provide you with that after opening up a ticket with support?
About 2 weeks ago, i had to toss this in to my .htaccess file to get the "10-hits every second" to stop. They were hitting my servers for several days. About a week later, I commented out the deny, and they instantly showed up again from Singapore. so i uncommented it to block them again.
The bad part about this, is that there is a huge server in
Texas Colorado that also begins with
74 47, so their traffic is also blocked. But I'm fine with that

<Limit GET HEAD POST>
order allow,deny
allow from all
# Singapore
deny from 47.0.0.0/8
</Limit>