My IP blacklist. Below are the subnets that I exclude from my SMTP server.

4.19.77.0 255.255.255.0
4.43.178.116
61.139.47.0 255.255.255.0
62.194.84.81
63.77.41.0 255.255.255.0
63.85.195.0 255.255.255.0
63.169.42.0 255.255.255.0
64.5.192.0 255.255.192.0
64.37.64.0 255.255.255.192
64.156.222.0 255.255.255.0
65.61.189.0 255.255.255.0
65.218.173.0 255.255.255.0
66.129.64.0 255.255.128.0
66.165.64.0 255.255.224.0
66.165.96.0 255.255.240.0
66.180.247.0 255.255.255.0
66.201.64.0 255.255.255.192
141.150.233.73
164.77.0.0 255.255.0.0
165.132.0.0 255.255.0.0
192.216.78.0 255.255.255.0
192.216.159.0 255.255.255.0
200.0.0.0 255.0.0.0
204.180.130.0 255.255.255.0
206.132.3.112
207.0.129.0 255.255.255.0
209.236.10.0 255.255.255.0
210.193.11.0 255.255.255.0
211.0.0.0 255.0.0.0
211.216.50.0 255.255.255.0
211.227.74.0 255.255.255.0
212.154.35.0 255.255.255.0
216.15.128.0 255.255.128.0
216.240.128.0 255.255.224.0
217.0.226.0 255.255.255.0
218.0.0.0 255.0.0.0
218.11.25.19 255.255.255.0
218.14.0.0 255.255.0.0
218.147.92.0 255.255.255.0
218.184.145.0 255.255.255.0