Ssh – Can you block an ip with multiple connections? (Apache ddos attack)

My server is under a Apache ddos attack right now. There's a ton of single ip addresses with 30+ connections.

When I use this SSH command:

netstat -n | grep ':80' | awk -F' ' '{print $5}' | awk -F':' '{print $1}' | sort | uniq -c | sort -n

I'm getting this:

     30 69.144.146.74
     31 190.216.242.195
     31 92.20.224.127
     34 24.127.224.73
     37 197.34.29.122
     37 85.225.133.82
     38 108.29.62.196
     38 86.95.44.115
     40 66.62.146.84
     40 94.123.91.147
     46 24.117.238.91
     48 70.112.112.127
     48 71.58.158.150
     48 75.65.172.192
     51 99.127.238.167
     52 99.98.74.66
     53 107.7.34.66
     54 95.238.27.3

I've black listed over 100 ip's already, but within 5 min. there's all new ip's with 50+ connections.

I have no idea what to do right now. Is there a way to only allow a ip address to have 1 connection at a time? Or, is there a firewall that can protect against this thing? I'm freaking out here, how can this be fixed? Thanks.