diff --git a/ipv6/us.cidr b/ipv6/us.cidr
index c02ca40f8..53404f1ed 100644
--- a/ipv6/us.cidr
+++ b/ipv6/us.cidr
@@ -376,6 +376,7 @@
 2407:40::/32
 2407:1580::/32
 2407:5880::/29
+2407:5cc0::/32
 2407:b480::/32
 2600::/28
 2600:100::/28