How to ban an IP range from accessing my server?

Hello, I am completely new to doing this, could you explain in detail how I can ban an IP range from accessing my server? Every single minute I receive automated emails from my firewall saying that an IP such as 66.98.69.112 was attacking my host and it was dropped, I assume if I were to ban the IP range of:

66.98.60.167 -> 66.98.188.208

I would no longer get those emails?

 

 

 

 

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