diff --git a/all/ipv6.txt b/all/ipv6.txt
index 649123b8..97f21276 100644
--- a/all/ipv6.txt
+++ b/all/ipv6.txt
@@ -3216,7 +3216,7 @@
 2406:da00:a000::/40
 2406:da00:b000::/40
 2406:da00:c000::/40
-2406:da00:c800::/64
+2406:da00:c800::/40
 2406:da00:e000::/40
 2406:da00:f000::/40
 2406:da00:ff00::/48
diff --git a/all/ipv6_merged.txt b/all/ipv6_merged.txt
index 5c3cb81b..432635b3 100644
--- a/all/ipv6_merged.txt
+++ b/all/ipv6_merged.txt
@@ -539,7 +539,7 @@
 2406:da00:a000::/40
 2406:da00:b000::/40
 2406:da00:c000::/40
-2406:da00:c800::/64
+2406:da00:c800::/40
 2406:da00:e000::/40
 2406:da00:f000::/40
 2406:da00:ff00::/48
diff --git a/amazon/ipv6.txt b/amazon/ipv6.txt
index e68d4e9a..76422e84 100644
--- a/amazon/ipv6.txt
+++ b/amazon/ipv6.txt
@@ -487,7 +487,7 @@
 2406:da00:a000::/40
 2406:da00:b000::/40
 2406:da00:c000::/40
-2406:da00:c800::/64
+2406:da00:c800::/40
 2406:da00:e000::/40
 2406:da00:f000::/40
 2406:da00:ff00::/48
diff --git a/amazon/ipv6_merged.txt b/amazon/ipv6_merged.txt
index 48c43f81..82fba0a4 100644
--- a/amazon/ipv6_merged.txt
+++ b/amazon/ipv6_merged.txt
@@ -410,7 +410,7 @@
 2406:da00:a000::/40
 2406:da00:b000::/40
 2406:da00:c000::/40
-2406:da00:c800::/64
+2406:da00:c800::/40
 2406:da00:e000::/40
 2406:da00:f000::/40
 2406:da00:ff00::/48