*** Let's Encrypt validation server IP addresses ***
Updated: 11/9/'25, 1/9/'26, 3/10/'26, 5/10/'26
IP Cloud Date
------------ ------------ ------------------------
3.0.50.154 Amazon Tech SG 5/14/'24
3.0.181.204 Amazon Data Services SG 7/11/'25
3.1.176.57 Amazon Data Services SG 1/9/'26
3.14.3.69 Amazon Tech 5/13/'24
3.14.255.131 Amazon Tech
3.14.255.232 Amazon Tech 10/27/'23
3.15.160.194 Amazon Techm 5/9/'26
3.16.112.82 Amazon Tech
3.16.213.50 Amazon Tech 10/29/'23
3.17.71.143 Amazon Tech
3.19.55.121 Amazon Tech
3.19.56.43 Amazon Tech
3.19.120.239 Amazon Tech
3.20.206.24 Amazon Tech 3/17/'23
3.21.39.207 Amazon Tech
3.21.43.5 Amazon Tech
3.21.185.231 Amazon Tech
3.22.66.161 Amazon Tech
3.22.70.135 Amazon Tech
3.22.187.24 Amazon Tech
3.64.250.53 Amazon Tech
3.64.251.85 Amazon Tech
3.66.29.156 Amazon Tech
3.67.34.92 Amazon Tech
3.68.27.193 Amazon Tech
3.68.183.249 Amazon Tech
3.69.19.58 Amazon Tech
3.69.24.161 Amazon Tech
3.69.165.224 Amazon Tech
3.69.241.162 Amazon Tech
3.70.173.52 Amazon Tech
3.70.173.240 Amazon Tech
3.70.205.7 Amazon Tech
3.70.226.171 Amazon Tech
3.72.0.27 Amazon Tech
3.72.51.68 Amazon Tech
3.72.73.233 Amazon Tech
3.73.52.92 Amazon Tech
3.73.159.42 Amazon Tech
3.74.164.89 Amazon Tech
3.120.130.29 Amazon Tech
3.121.212.136 Amazon Tech
3.122.178.200 Amazon Tech
3.123.37.118 Amazon Tech
3.124.187.251 Amazon Tech
3.125.19.113 Amazon Tech
3.128.26.105 Amazon Tech
3.131.36.184 Amazon Tech
3.133.99.173 Amazon Tech
3.133.109.33 Amazon Tech 1/9/'26
3.134.86.26 Amazon Tech
3.135.201.96 Amazon Tech
3.136.27.87 Amazon Tech
3.137.151.20 Amazon Tech 3/12/'25
3.137.173.92 Amazon Tech 5/10/'26
3.138.192.33 Amazon Tech 9/10/'25
3.140.192.187 Amazon Tech 10/29/'23
3.140.247.33 Amazon Tech
3.140.247.189 Amazon Tech 1/9/'26
3.141.42.59 Amazon Tech
3.141.201.55 Amezon Tech 1/11/'25
3.142.122.14 Amazon Tech
3.143.0.179 Amazon Tech 11/09/'25
3.143.169.11 Amazon Tech 5/9/'26
3.143.170.124 Amazon Tech 5/12/'25
3.143.204.187 Amazon Tech
3.143.223.150 Amazon Tech
3.143.233.9 Amazon Tech 1/15/'23
3.143.254.60 Amazon Tech
3.144.10.135 Amazon Tech 10/19/'23
3.144.34.165 Amazon Tech
3.144.45.104 Amazon Tech 5/9/'26
3.144.75.81 Amazon Tech
3.144.116.248 Amazon Tech 9/10/'25
3.144.218.183 Amazon Tech
3.145.37.14 Amazon Tech 7/15/'23
3.145.96.244 Amazon Tech
3.145.191.206 Amazon Tech
3.147.77.110 Amazon Tech 9/10/'25
3.149.254.206 Amazon Tech 5/9/'26
13.48.59.52 Amazon Data Services SE 7/11/'25
13.48.129.186 Amazon Data Services SE 9/10/'25
13.49.46.214 Amazon Data Services SE 5/13/'24
13.50.15.224 Amazon Data Services SE 5/14/'24
13.50.236.71 Amazon Data Services SE 1/9/'26
13.50.245.224 Amazon Data Services SE 1/9/'26
13.51.233.154 Amazon Data Services SE 5/9/'26
13.51.235.68 Amazon Data Services SE 9/12/'24
13.53.124.220 Amazon Data Services SE 5/13/'24
13.53.207.238 Amazon Data Services SE 1/11/'25
13.58.30.69 Amazon Tech 4/10/'23
13.59.153.150 Amazon Tech
13.60.23.140 Amazon Data Services SE 9/10/'25
13.60.34.172 Amazon SE 5/12/'25
13.60.93.245 Amazon SE 9/10/'25
13.60.157.246 Amazon Sweden 9/12/'24
13.60.183.193 Amazon Sweden 9/12/'24
13.60.194.24 Amazon Sweden 9/12/'24
13.61.7.50 Amazon Data Services SE 5/12/'25
13.61.18.121 Amazon Data Services SE 11/09/'25
13.63.45.133 Amazon Data Services SE 5/9/'26
13.212.73.241 Amazon Data Services SE 9/12/'24
13.212.250.197 Amazon Data Services SE 1/11/'25
13.213.12.154 Amazon Data Services SG 5/9/'26
13.214.170.141 Amazon Data Services SG 5/23/'24
13.215.156.112 Amazon Data Services SG 5/9/'26
13.229.155.75 Amazon Data Services SG 5/13/'24
13.250.3.247 Amazon Data Services SG 5/14/'24
13.250.17.71 Amazon Data Services SG 3/12/'25
13.250.106.177 Amazon Data Services SG 9/10/'25
13.250.172.89 Amazon Data Services SG 7/13/'24
13.251.16.211 Amazon Data Services SG 9/10/'25
16.16.66.120 Amazon Data Services SE 3/12/'25
16.16.122.56 Amazon Data Services SE 5/10/'26
16.16.192.56 Amazon Data Services SE 5/14/'24
16.16.192.69 Amazon Data Services SE 9/12/'24
16.146.19.122 Amazon.com 5/9/'26
16.170.15.68 Amazon Data Services SE 5/9/'26
16.170.221.52 Amazon Data Services SE 1/9/'26
16.170.243.111 Amazon Data Services SE 5/9/'26
16.171.1.246 Amazon Data Services SE 5/14/'24
16.171.3.40 Amazon Data Services SE 7/13/'24
16.171.170.178 Amazon Data Services SE 11/09/'25
18.116.13.211 Amazon Tech
18.116.86.117 Amazon Tech
18.116.165.193 Amazon Tech
18.116.237.27 Amazon Tech 5/16/'23
18.117.119.45 Amazon Tech 7/13/'24
18.117.185.176 Amazon Tech 5/14/'24
18.117.191.69 Amazon Tech 5/12/'25
18.118.160.177 Amazon Tech
18.118.252.192 Amazon Tech 9/12/'24
18.136.101.23 Amazon SG 5/12/'25
18.141.8.137 Amazon Tech 5/14/'24
18.143.133.155 Amazon Data Services SG 3/10/'26
18.143.155.171 Amazon Data Services SG 1/9/'26
18.156.79.179 Amazon Tech
18.159.141.56 Amazon Tech
18.159.196.172 Amazon Tech
18.184.29.122 Amazon Tech
18.184.114.154 Amazon Tech
18.184.220.107 Amazon Tech
18.185.102.79 Amazon Tech
18.185.104.214 Amazon Tech
18.185.121.82 Amazon Tech
18.188.88.18 Amazon Tech
18.188.198.179 Amazon Tech 10/29/'23
18.188.201.12 Amazon Tech 7/11/'25
18.191.148.0 Amazon Tech 10/29/'23
18.192.23.35 Amazon Tech
18.192.36.99 Amazon Tech
18.192.55.112 Amazon Tech
18.192.99.12 Amazon Tech
18.192.245.0 Amazon Tech
18.194.58.132 Amazon Tech
18.194.90.174 Amazon Tech
18.196.96.172 Amazon Tech
18.196.102.134 Amazon Tech
18.197.70.37 Amazon Tech
18.197.97.115 Amazon Tech
18.197.129.178 Amazon Tech
18.216.77.148 Amazon Tech
18.217.125.26 Amazon Tech
18.217.198.241 Amazon Tech
18.218.118.23 Amazon Tech 5/9/'26
18.218.154.93 Amazon Tech 1/9/'26
18.218.241.32 Amazon Tech 3/10/'26
18.219.62.63 Amazon Tech 9/12/'24
18.219.129.43 Amazon Tech 9/14/'23
18.219.221.239 Amazon Tech
18.220.14.254 Amazon Tech 11/13/'23
18.220.25.215 Amazon Tech
18.220.192.183 Amazon Tech
18.221.77.37 Amazon Tech
18.222.105.102 Amazon Tech
18.222.132.50 Amazon Tech 9/10/'25
18.222.134.135 Amazon Tech
18.222.145.89 Amazon Tech
18.222.187.65 Amazon Tech
18.222.194.125 Amazon Teck 11/09/'25
18.223.206.237 Amazon Tech 1/13/'24
18.224.20.83 Amazon Tech
18.224.37.69 Amazon Tech
18.225.32.50 Amazon Tech
18.225.195.39 Amazon Tech 11/12/'24
18.236.144.238 Amazon Tech
18.236.188.173 Amazon Tech
18.236.228.243 Amazon Tech
18.249.169.135 Amazon Tech 1/11/'25
23.178.112.100 Internet Security Research 11/12/'24
23.178.112.102 Internet Security Research 10/29/'23
23.178.112.103 Internet Security Research 10/19/'23, 10/27/'23, 7/11/'25 9/10/'25
23.178.112.104 Internet Security Research 10/29/'23, 9/12/'24 3/12/'25 9/10/'25 5/9/'26
23.178.112.105 Internet Security Research 5/12/'25, 12/09/'25 5/10/'26
23.178.112.106 Internet Security Research 3/17/'23, 10/19/'23, 10/27/'23, 10/29/'23 1/11/'25, 12/09/'25 5/9/'26
23.178.112.107 Internet Security Research 5/16/'23, 7/15/'23, 10/19/'23, 10/29/'23, 11/13/'23, 1/13/'24, 9/12/'24 5/10/'26
23.178.112.108 Internet Security Research 10/27/'23 3/10/'26
23.178.112.109 Internet Security Research 3/13/'24, 5/13/'24, 9/12/'24
23.178.112.200 Internet Security Research 10/27/'23
23.178.112.202 Internet Security Research 10/19/'23, 10/27/'23, 10/29/'23
23.178.112.203 Internet Security Research 10/27/'23, 10/27/'23, 10/29/'23
23.178.112.205 Internet Security Research 5/13/'24
23.178.112.208 Internet Security Research 10/19/'23, 10/27/'23
23.178.112.209 Internet Security Research 9/14/'23, 10/19/'23, 10/29/'23
23.178.112.210 Internet Security Research 9/10/'25, 11/09/'25
23.178.112.211 Internet Security Research 9/12/'24, 12/09/'25 5/10/'26
23.178.112.212 Internet Security Research 1/11/'25, 9/10/'25, 12/09/'25, 1/9/'26
23.178.112.213 Internet Security Research 11/09/'25 5/9/'26
23.178.112.215 Internet Security Research 7/13/'24, 5/12/'25
23.178.112.219 Internet Security Research 9/12/'24 1/9/'26 5/9/'26
34.209.154.109 Amazon Tech 3/12/'25
34.209.191.57 Amazon Tech
34.209.232.166 Amazon Tech
34.211.6.84 Amazon Tech
34.211.11.88 Amazon Tech
34.211.60.134 Amazon Tech
34.213.29.66 Amazon Tech 9/10/'25
34.213.106.112 Amazon Tech 4/10/'23
34.215.79.212 Amazon Tech 9/10/'25
34.215.121.14 Amazon Tech
34.216.130.13 Amazon Tech
34.216.192.11 Amazon Tech
34.217.107.185 Amazon Tech
34.218.205.49 Amazon Tech 11/13/'23
34.219.87.132 Amazon Tech
34.219.101.95 Amazon Tech 10/29/'23
34.219.195.117 Amazon Tech 10/19/'23
34.220.82.248 Amazon Tech
34.220.122.109 Amazon Tech 10/29/'23
34.220.126.78 Amazon Tech
34.220.129.39 Amazon Tech
34.220.210.147 Amazon Tech 5/12/'25
34.221.5.200 Amazon Tech 7/13/'24
34.221.143.127 Amazon Tech
34.221.186.243 Amazon Tech
34.221.255.206 Amazon Tech
34.222.98.48 Amazon Tech
34.222.119.160 Amazon Tech 5/13/'24
34.222.229.130 Amazon Tech
34.222.237.95 Amazon Tech
35.86.109.49 Amazon.com
35.86.125.186 Amazon.com 3/13/'24
35.86.155.247 Amazon.com 11/11/'25
35.86.160.6 Amazon.com
35.87.22.55 Amazon.com
35.87.22.7 Amazon.com 1/9/'26
35.87.132.237 Amazon.com
35.87.154.18 Amazon.com
35.89.57.200 Amazon.com 3/17/'23
35.89.74.29 Amazon.com
35.90.9.128 Amazon.com
35.90.113.149 Amazon.com 10/27/'23
35.90.180.100 Amazon.com 7/15/'23
35.92.87.236 Amazon.com
35.92.212.138 Amazon.com 5/16/'23
35.92.222.63 Amazon.com 1/15/'23
35.157.61.61 A100 ROW GmbH
35.160.248.88 Amazon.com
35.161.21.117 Amazon.com
35.162.128.218 Amazon.com
35.163.64.218 Amazon.com
35.166.54.218 Amazon.com 9/10/'25
35.166.77.114 Amazon EC2 5/14/'24
44.249.178.168 Amazon.com 9/10/'25
44.250.177.252 Amazon.com 1/9/'26
47.129.30.65 Amazon Data Services SG 5/9/'26
47.129.104.176 Amazon Data Services SG 5/9/'26
47.129.124.162 Amazon Data Services SG 1/11/'25
47.129.133.204 Amazon Data Services SG 5/10/'26
47.129.174.36 Amazon Data Services SG 5/10/'26
47.129.194.245 Amazon Data Services SG 5/12/'25
47.129.221.84 Amazon Data Services SG 9/12/'24
47.129.237.42 Amazon Data Services SG 1/9/'26
51.20.63.129 Amazon EC2, DE 11/12/'24
51.20.71.195 A100 5/14/'24
51.20.119.36 EC2 3/10/'26
51.20.126.8 Amazon EC2 9/10/'25
52.13.103.75 Amazon Tech
52.13.40.34 Amazon Tech 1/11/'25
52.15.87.53 Amazon Tech
52.15.254.228 Amazon Tech
52.24.73.83 Amazon Tech
52.25.122.42 Amazon Tech
52.25.138.85 Amazon Tech
52.26.214.19 Amazon Tech 5/9/'26
52.27.246.46 Amazon Tech 10/19/'23
52.28.236.88 Amazon Tech
52.29.173.72 A100 ROW GmbH 4/10/'23
52.33.189.219 Amazon Tech
52.38.132.134 Amazon Tech 7/11/'25
52.39.4.59 Amazon Tech
52.41.228.68 Amazon Tech
52.58.118.98 Amazon Tech
52.58.148.172 Amazon Tech
52.59.65.64 Amazon Tech
54.93.194.3 A100 ROW GmbH
54.93.218.87 A100 ROW GmbH
54.169.6.251 Amazon Tech 5/9/'26
54.169.207.183 Amazon Tech 9/10/'25
54.184.23.186 Amazon.com
54.185.185.210 Amazon.com
54.186.200.191 Amazon.com
54.189.22.122 Amazon.com
54.190.55.114 Amazon.com
54.191.60.25 Amazon.com
54.191.124.186 Amazon.com 5/13/'24
54.191.192.47 Amazon.com
54.201.68.233 Amazon.com 5/10/'26
54.201.106.94 Amazon.com
54.201.251.93 Amazon.com
54.202.174.126 Amazon.com
54.213.165.20 Amazon.com
54.213.166.159 Amazon.com 11/09/'25
54.213.229.162 Amazon.com
54.214.125.224 Amazon.com 9/12/'24
54.214.184.76 Amazon.com
54.244.40.45 Amazon.com
54.244.215.241 Amazon.com 5/10/'26
54.245.176.12 Amazon.com
54.254.174.89 Amazon EC2 5/14/'24
54.255.138.114 Amazon Data Services JP 11/09/'25
64.78.149.164 Flexential Colorado
66.133.109.36 Flexential Colorado 4/10/'23
172.65.32.248 Cloudflare, Inc. 1/15/'23
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