diff --git a/ipv6/us.cidr b/ipv6/us.cidr
index 5050ddcf4..f4ecb0304 100644
--- a/ipv6/us.cidr
+++ b/ipv6/us.cidr
@@ -640,6 +640,7 @@
 2602:80b:6000::/40
 2602:80b:8000::/40
 2602:80b:9000::/40
+2602:fc4c::/36
 2602:fc4e::/36
 2602:fc4f::/36
 2602:fc50::/36