Make sure this makes sense for you but I've started to block a lot of commercial Cloud services and easily accessible providers as they are a very high source of abusive traffic.  The cost savings for a lot of organizations are huge, as you now have less bandwidth usage and less resource usage from garbage/bot/malicious traffic.  This mainly works for when you can be reasonably sure that your audience has no business visiting your service(s) from freely accessible commercial IP space (eg. Amazon, Huawei Cloud, Oracle Cloud etc..).  In general, any large service that offers Cloud to anyone without proper authentication (having a credit card is not enough authentication) is going to be a huge source of abusive traffic.

Some is not meant to be abusive but many of the SEO tools and services will scan your site, often causing a huge load by constantly hitting your services every second or several times per second.  Even if this does not slow your services down, there is a cost to it and you may be surprised at how much it is costing you or how much extra CPU, RAM and disk IO is wasted to abuse.

This will serve as a comprehensive list of suggested ranges to block.  If this causes issues from legitimate traffic, make sure you have a mechanism in place to whitelist "known good IPs" that you, your work or clients may be using.  Also discourage the use of rotating IPs unless there is a good reason, all traffic should be received by static IPs that are whitelisted.

If you have publicly accessible services, there are generally not too many good reasons why users should be hitting you from commercial cloud services.  These services are a huge waste of resources as in many cases, I've seen 80-90% of traffic is just garbage traffic, and often it is a competitor or bad actor using these services to actively attack public services.

Now if you happen to know a service that uses a cloud service, such as Pinterest using Amazon and don't want to block it, you can whitelist their IP ranges as most reputable services will list their range of IPs for this purpose.

This list cannot be guaranteed to always be up to date but from the point in time the post was made.

Note that this is not recommended as replacement for good security and firewalls but it already reduces the abusive traffic angle.  I don't believe it reduces the chance of hackers but generally unintentionaly malicious traffic based on examples I've mentioned.  However, given that the Cloud providers offer services to anyone, they are still a source of intentionally maliicious traffic because throw away accounts are allowed on many Cloud services (eg. free trial that one uses with a prepaid credit card for the purposes of abuse).

The presence or lack of presence of a Cloud provider here does not mean they are better or worse for abuse, but I just haven't gotten a chance to list them here yet.

Huawei Cloud is a good idea to block as I've seen too many cases of abuse from their ranges despite them not being considered such a huge provider compared to AWS.

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Digital Ocean

Digital Ocean is a huge offender based on experience and we have never seen any response to abuse complaints.

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 34.177.36.0/23
 34.1.144.0/20
 34.17.0.0/16
 34.157.124.0/23
 34.157.250.0/23
 34.39.0.0/17
 34.89.0.0/17
 34.105.128.0/17
 34.127.186.0/23
 34.128.52.0/22
 34.142.0.0/17
 34.147.128.0/17
 34.157.36.0/22
 34.157.40.0/22
 34.157.168.0/22
 35.189.64.0/18
 35.197.192.0/18
 35.203.210.0/23
 35.203.212.0/22
 35.203.216.0/22
 35.214.0.0/17
 35.220.20.0/22
 35.230.128.0/19
 35.234.128.0/19
 35.235.48.0/20
 35.242.20.0/22
 35.242.128.0/18
 35.246.0.0/17
 34.0.224.0/24
 34.0.226.0/24
 34.40.0.0/17
 34.89.128.0/17
 34.104.112.0/23
 34.107.0.0/17
 34.118.244.0/22
 34.124.48.0/23
 34.141.0.0/17
 34.157.48.0/20
 34.157.176.0/20
 34.159.0.0/16
 35.198.64.0/18
 35.198.128.0/18
 35.207.64.0/18
 35.207.128.0/18
 35.220.18.0/23
 35.234.64.0/18
 35.235.32.0/20
 35.242.18.0/23
 35.242.192.0/18
 35.246.128.0/17
 34.1.224.0/19
 34.32.128.0/17
 34.34.0.0/17
 34.90.0.0/15
 34.104.126.0/23
 34.124.62.0/23
 34.141.128.0/17
 34.147.0.0/17
 34.157.80.0/23
 34.157.92.0/22
 34.157.208.0/23
 34.157.220.0/22
 35.204.0.0/16
 35.214.128.0/17
 35.220.16.0/23
 35.234.160.0/20
 35.242.16.0/23
 34.65.0.0/16
 34.104.110.0/23
 34.124.46.0/23
 35.216.128.0/17
 35.220.44.0/24
 35.235.216.0/21
 35.242.44.0/24
 34.0.160.0/19
 34.153.38.0/24
 34.153.230.0/24
 34.154.0.0/16
 34.157.8.0/23
 34.157.121.0/24
 34.157.136.0/23
 34.157.249.0/24
 35.219.224.0/19
 34.1.0.0/20
 34.155.0.0/16
 34.157.12.0/22
 34.157.140.0/22
 34.163.0.0/16
 34.36.0.0/16
 34.49.0.0/16
 34.54.0.0/16
 34.95.64.0/18
 34.96.64.0/18
 34.98.64.0/18
 34.102.128.0/17
 34.104.27.0/24
 34.107.128.0/17
 34.110.128.0/17
 34.111.0.0/16
 34.116.0.0/21
 34.117.0.0/16
 34.120.0.0/16
 34.128.128.0/18
 34.144.192.0/18
 34.149.0.0/16
 34.160.0.0/16
 35.186.192.0/18
 35.190.0.0/18
 35.190.64.0/19
 35.190.112.0/20
 35.201.64.0/18
 35.227.192.0/18
 35.241.0.0/18
 35.244.128.0/17
 107.178.240.0/20
 130.211.4.0/22
 130.211.8.0/21
 130.211.16.0/20
 130.211.32.0/20
 34.1.32.0/20
 34.18.0.0/16
 34.157.126.0/23
 34.157.252.0/23
 34.1.48.0/20
 34.152.84.0/23
 34.166.0.0/16
 34.177.48.0/23
 34.0.64.0/19
 34.157.90.0/23
 34.157.216.0/23
 34.165.0.0/16
 34.19.128.0/17
 34.20.0.0/17
 34.47.0.0/18
 34.95.0.0/18
 34.104.76.0/22
 34.118.128.0/18
 34.124.12.0/22
 34.128.37.0/24
 34.128.42.0/23
 34.128.49.0/24
 34.128.58.0/23
 34.152.0.0/18
 35.203.0.0/17
 35.215.0.0/18
 35.220.43.0/24
 35.234.240.0/20
 35.242.43.0/24
 34.0.32.0/20
 34.104.114.0/23
 34.124.50.0/23
 34.124.112.0/20
 34.130.0.0/16
 34.152.69.0/24
 34.157.255.0/24
 34.51.0.0/17
 34.153.42.0/23
 34.153.234.0/23
 34.39.128.0/17
 34.95.128.0/17
 34.104.80.0/21
 34.124.16.0/21
 34.151.0.0/18
 34.151.192.0/18
 35.198.0.0/18
 35.199.64.0/18
 35.215.192.0/18
 35.220.40.0/24
 35.235.0.0/20
 35.242.40.0/24
 35.247.192.0/18
 34.0.48.0/20
 34.104.50.0/23
 34.127.178.0/23
 34.153.33.0/24
 34.153.225.0/24
 34.176.0.0/16
 8.34.210.0/24
 8.34.212.0/22
 8.34.216.0/22
 8.35.192.0/21
 23.236.48.0/20
 23.251.144.0/20
 34.0.225.0/24
 34.16.0.0/17
 34.27.0.0/16
 34.28.0.0/14
 34.33.0.0/16
 34.41.0.0/16
 34.42.0.0/16
 34.44.0.0/15
 34.46.0.0/16
 34.66.0.0/15
 34.68.0.0/14
 34.72.0.0/16
 34.118.200.0/21
 34.121.0.0/16
 34.122.0.0/15
 34.128.32.0/22
 34.132.0.0/14
 34.136.0.0/16
 34.153.48.0/21
 34.153.240.0/21
 34.157.84.0/23
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 34.157.212.0/23
 34.157.224.0/20
 34.170.0.0/15
 34.172.0.0/15
 34.177.52.0/22
 35.184.0.0/16
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 35.188.128.0/18
 35.188.192.0/19
 35.192.0.0/15
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 35.202.0.0/16
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 35.220.64.0/19
 35.222.0.0/15
 35.224.0.0/15
 35.226.0.0/16
 35.232.0.0/16
 35.238.0.0/15
 35.242.96.0/19
 104.154.16.0/20
 104.154.32.0/19
 104.154.64.0/19
 104.154.96.0/20
 104.154.113.0/24
 104.154.114.0/23
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 104.154.120.0/23
 104.154.128.0/17
 104.155.128.0/18
 104.197.0.0/16
 104.198.16.0/20
 104.198.32.0/19
 104.198.64.0/20
 104.198.128.0/17
 107.178.208.0/20
 108.59.80.0/21
 130.211.112.0/20
 130.211.128.0/18
 130.211.192.0/19
 130.211.224.0/20
 146.148.32.0/19
 146.148.64.0/19
 146.148.96.0/20
 162.222.176.0/21
 173.255.112.0/21
 199.192.115.0/24
 199.223.232.0/22
 199.223.236.0/24
 34.22.0.0/19
 35.186.0.0/17
 35.186.128.0/20
 35.206.32.0/19
 35.220.46.0/24
 35.242.46.0/24
 107.167.160.0/20
 108.59.88.0/21
 173.255.120.0/21
 34.23.0.0/16
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 35.243.128.0/17
 104.196.0.0/18
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 104.196.128.0/18
 104.196.192.0/19
 162.216.148.0/22
 34.21.0.0/17
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 34.1.16.0/20
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 34.53.0.0/17
 34.82.0.0/15
 34.105.0.0/17
 34.118.192.0/21
 34.127.0.0/17
 34.145.0.0/17
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 35.227.128.0/18
 35.230.0.0/17
 35.233.128.0/17
 35.242.48.0/21
 35.243.32.0/21
 35.247.0.0/17
 104.196.224.0/19
 104.198.0.0/20
 104.198.96.0/20
 104.199.112.0/20
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 34.118.240.0/22
 34.124.8.0/22
 34.125.0.0/16
 35.219.128.0/18
 34.37.0.0/16
 34.128.46.0/23
 34.128.62.0/23
 

Hetzner

5.9.0.0/16
5.75.128.0/17
5.161.0.0/21
5.161.164.0/22
5.161.168.0/21
5.161.238.0/23
5.222.0.0/15
23.88.0.0/17
37.27.0.0/16
45.145.227.0/24
46.4.0.0/16
46.62.128.0/17
49.12.0.0/15
65.21.0.0/16
65.108.0.0/15
77.42.0.0/17
78.46.0.0/15
78.138.62.0/24
85.10.192.0/18
88.99.0.0/16
88.198.0.0/16
89.167.0.0/17
91.99.0.0/16
91.107.128.0/17
91.190.240.0/21
91.233.8.0/22
94.130.0.0/16
95.216.0.0/15
116.202.0.0/15
128.140.0.0/17
135.181.0.0/16
136.243.0.0/16
138.199.128.0/17
138.201.0.0/16
142.132.128.0/17
144.76.0.0/16
148.251.0.0/16
157.90.0.0/16
157.180.0.0/17
159.69.0.0/16
162.55.0.0/16
167.233.0.0/16
167.235.0.0/16
168.119.0.0/16
171.25.225.0/24
176.9.0.0/16
178.63.0.0/16
178.212.75.0/24
185.12.64.0/22
185.50.120.0/23
185.107.52.0/22
185.126.28.0/22
185.157.83.0/24
185.157.176.0/22
185.171.224.0/22
185.189.228.0/22
185.213.45.0/24
185.216.237.0/24
185.226.99.0/24
185.228.8.0/23
185.242.76.0/24
185.253.111.0/24
188.34.128.0/17
188.40.0.0/16
188.245.0.0/16
193.25.170.0/23
193.110.6.0/23
193.163.198.0/24
194.42.180.0/22
194.42.184.0/22
194.62.106.0/24
195.60.226.0/24
195.201.0.0/16
195.248.224.0/24
197.242.84.0/22
201.131.3.0/24
204.29.146.0/24
213.133.96.0/19
213.232.193.0/24
213.239.192.0/18
216.55.108.0/22

ahrefs (SEO tool)

You can often see your logs dominated by their IPs.  Block all of ahrefs listed IPs.

On any random day, a lot of sites will receive quite a bit of traffic and high frequency queries from ahrefs.  If you aren't using their SEO service there is no point in allowing their traffic.

54.36.148.0/24
54.36.149.0/24
 
195.154.122.0/24
195.154.123.0/24
195.154.126.0/24
195.154.127.0/24
 
51.222.253.0/26

167.114.139.0/24
54.39.6.0/24
54.39.136.0/24
142.44.233.0/24
54.39.0.0/24
51.161.37.0/24
142.44.220.0/24
54.39.210.0/24
54.39.203.0/24
148.113.130.0/24
51.222.95.0/24
51.161.65.0/24
54.39.89.0/24
15.235.27.0/24
148.113.128.0/24
15.235.96.0/24
142.44.228.0/24
142.44.225.0/24
51.222.168.0/24
15.235.98.0/24
 
54.37.118.64/27
51.75.236.128/27
92.222.108.96/27
51.68.247.192/27
176.31.139.0/27
5.39.1.224/27
92.222.104.192/27
37.59.204.128/27
94.23.188.192/27
5.39.109.160/27
 
51.195.244.0/24
198.244.168.0/24
198.244.226.0/24
51.195.183.0/24
198.244.183.0/24
54.38.147.0/24
198.244.240.0/24
198.244.242.0/24
51.89.129.0/24
51.195.215.0/24

168.119.68.0/24
198.244.186.0/24
202.94.84.0/24

168.119.64.0/24
168.119.65.0/24

Other proposed blocks:

GCP, Vultr, Hetzner, Azure, Oracle in general any large Cloud provider and any provider that allows a trial or cheap/easy access should be blocked first and only specific static IPs should be whitelisted.

abusive, ip, ranges, blacklistmake, ve, accessible, providers, savings, organizations, bandwidth, usage, resource, bot, malicious, mainly, reasonably, freely, eg, amazon, huawei, oracle, etc, offers, authentication, seo, scan, costing, cpu, ram, disk, io, comprehensive, legitimate, mechanism, whitelist, quot, ips, discourage, rotating, static, whitelisted, publicly, generally, users, competitor, actively, pinterest, reputable, guaranteed, recommended, replacement, firewalls, reduces, hackers, unintentionaly, examples, intentionally, maliicious, prepaid, purposes, provider, haven, aws, digital, offender, complaints, gcp, vultr, hetzner, azure, allows, blocked,

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