diff --git a/all/ipv4.txt b/all/ipv4.txt
index ec03b48c..fa8e928d 100644
--- a/all/ipv4.txt
+++ b/all/ipv4.txt
@@ -24707,6 +24707,7 @@
 51.16.255.0/24
 51.17.0.0/24
 51.17.1.0/24
+51.17.72.0/22
 51.18.0.0/22
 51.18.4.0/22
 51.18.8.0/22
diff --git a/amazon/ipv4.txt b/amazon/ipv4.txt
index 97bee8f4..97d76ca8 100644
--- a/amazon/ipv4.txt
+++ b/amazon/ipv4.txt
@@ -3304,6 +3304,7 @@
 51.16.255.0/24
 51.17.0.0/24
 51.17.1.0/24
+51.17.72.0/22
 51.20.0.0/16
 51.21.0.0/16
 51.24.0.0/13