Which is better: Blocking IP on Vbulletin or on your Host?

[93Corvette]

I run a military forum. One thing I don't want is North Korea to have access to my site. There are my places I can find the IP address for that country. So I have two questions:

1. Is it better to ban the IP address on Vbulletin or your host (Example: Siteground)
What is the benefit of each?

2. Can you block a range of IP on Vbulletin (example 10.5.3.3-10.5.3.40) or do you have to list each and every one?

[Floris]

I always block using htaccess or the firewall.
I hardly ever use vBulletin's admincp > user banning options > feature to do it.