Abusive IP ranges blacklist

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, for cheap or offer any free trials/refunds (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 or VPN providers (unless your users genuinely need a VPN for security or to access your 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.

Note that this is not recommended as replacement for good security and firewalls but it already reduces the abusive traffic angle.

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.

All proposed blocks are based on real-world examples (eg. abusive traffic coming from those hosts).

In another post we'll list a bunch of bad user agents to block.

When not to use Cloud Providers

1.) If you value privacy or control of your data

2.) If you are using it as a VPN or other outward facing service there is a good chance it may be transparently blocked.

3.) If you must use a VPN, it is best to run it from one of your office's legitimate internet connection as these IPs are the least likely to be blocked.

Where are they really from?

Beware that user agents can be forged, many DDOS services will try to masquerade as a legitimate service or scanning tool but you will often find that there is no relation (eg. a bot hitting your site that has the Google bot agent set but is really from Digital Ocean and not truly Google).

Other proposed blocks:

In general any cheap provider and any large provider should probably be blocked. This especially means providers that offer a free trial or X-day money back guarantee.

GCP (Google Cloud)
Vultr (Cloud)
Hetzner (Cheap host)
Microsoft Azure
Oracle Cloud
Worldstream (smaller but abusive traffic)
Scaleway
OVH
Leaseweb

Block SEO Tools:

Popular tools include:

Moz
Ahrefs
SEMRush
Majestic SEO

If you aren't using the tools for the particular site(s) running then these should be blocked or at least give them a 403 based on the user agent.

We've seen several SEO tools used at once by determined attacker as a similar impact as DDOS by having reports run on the target site/URL done by several SEO tools or other scanning site performance tools that were otherwise legitimate.

Block Search Engines/Crawlers:

If you don't get traffic from certain search engines then consider blocking them. There are dozens of other smaller crawling services that cause huge issues.

Block AI Tools:

This has the double effect of preserving your resources and stopping AI from stealing or using your info in their replies.

Our experience is that most providers simply don't have time or care about the large amount of abuse reports they get (eg. complain and you will usually never receive any response or action).

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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https://www.gstatic.com/ipranges/cloud.json

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35.233.0.0/17
35.240.0.0/17
35.241.128.0/17
35.242.64.0/19
104.155.0.0/17
104.199.0.0/18
104.199.66.0/23
104.199.68.0/22
104.199.72.0/21
104.199.80.0/20
104.199.96.0/20
130.211.48.0/20
130.211.64.0/19
130.211.96.0/20
146.148.2.0/23
146.148.4.0/22
146.148.8.0/21
146.148.16.0/20
146.148.112.0/20
192.158.28.0/22
34.1.160.0/20
34.32.0.0/17
34.152.80.0/23
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
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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
34.157.96.0/20
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
35.188.0.0/17
35.188.128.0/18
35.188.192.0/19
35.192.0.0/15
35.194.0.0/18
35.202.0.0/16
35.206.64.0/18
35.208.0.0/15
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
104.154.116.0/22
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
34.24.0.0/15
34.26.0.0/16
34.73.0.0/16
34.74.0.0/15
34.98.128.0/21
34.118.250.0/23
34.138.0.0/15
34.148.0.0/16
34.152.72.0/21
34.177.40.0/21
35.185.0.0/17
35.190.128.0/18
35.196.0.0/16
35.207.0.0/18
35.211.0.0/16
35.220.0.0/20
35.227.0.0/17
35.229.16.0/20
35.229.32.0/19
35.229.64.0/18
35.231.0.0/16
35.237.0.0/16
35.242.0.0/20
35.243.128.0/17
104.196.0.0/18
104.196.65.0/24
104.196.66.0/23
104.196.68.0/22
104.196.96.0/19
104.196.128.0/18
104.196.192.0/19
162.216.148.0/22
34.21.0.0/17
34.48.0.0/16
34.85.128.0/17
34.86.0.0/16
34.104.60.0/23
34.104.124.0/23
34.118.252.0/23
34.124.60.0/23
34.127.188.0/23
34.145.128.0/17
34.150.128.0/17
34.157.0.0/21
34.157.16.0/20
34.157.128.0/21
34.157.144.0/20
35.186.160.0/19
35.188.224.0/19
35.194.64.0/19
35.199.0.0/18
35.212.0.0/17
35.220.60.0/22
35.221.0.0/18
35.230.160.0/19
35.234.176.0/20
35.236.192.0/18
35.242.60.0/22
35.243.40.0/21
35.245.0.0/16
34.1.16.0/20
34.157.32.0/22
34.157.160.0/22
34.162.0.0/16
34.104.56.0/23
34.127.184.0/23
34.161.0.0/16
35.206.10.0/23
34.0.128.0/19
34.157.46.0/23
34.157.174.0/23
34.174.0.0/16
34.19.0.0/17
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
34.157.112.0/21
34.157.240.0/21
34.168.0.0/15
35.185.192.0/18
35.197.0.0/17
35.199.144.0/20
35.199.160.0/19
35.203.128.0/18
35.212.128.0/17
35.220.48.0/21
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
34.20.128.0/17
34.94.0.0/16
34.102.0.0/17
34.104.64.0/21
34.108.0.0/16
34.118.248.0/23
34.124.0.0/21
35.215.64.0/18
35.220.47.0/24
35.235.64.0/18
35.236.0.0/17
35.242.47.0/24
35.243.0.0/21
34.22.32.0/19
34.104.52.0/24
34.106.0.0/16
34.127.180.0/24
35.217.64.0/18
35.220.31.0/24
35.242.31.0/24
34.16.128.0/17
34.104.72.0/22
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