block IP range

Hello every one
I have Dos attack from
221.217.10/24 and 61.53.200/24

How I can block this tow range of IPs

I don't have firewall installed and I don't have Iptables

I desabled iptables cause when it is started the server will be down at 6 AM each day

so I want to block these IPs by route command

But I don't know How I can block range IPs

 

 

 

 

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