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By making changes in PoP sites, ArvanCloud may also modify the CDN edge server IPs. So, in order to avoid possible disruptions and experience more stability, you need to add ArvanCloud IPs to the firewall of your origin servers.
Use this script to automatically whitelist new IP addresses in your server firewall.
The list of ArvanCloud IPs is always available from the following address.

185.143.232.0/22
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92.114.16.80/28
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188.229.116.16/29
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94.182.182.28/30
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185.228.238.0/28
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94.182.153.24/29
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94.101.182.0/27
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2.144.3.128/28
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89.45.48.64/28
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37.32.16.0/27
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37.32.17.0/27
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37.32.18.0/27
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37.32.19.0/27
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185.215.232.0/22
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109.230.200.48/29
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89.108.127.217/32
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