diff --git a/ipv6/in.cidr b/ipv6/in.cidr
index 786883a8..55a11343 100644
--- a/ipv6/in.cidr
+++ b/ipv6/in.cidr
@@ -1043,6 +1043,7 @@
 2001:df4:c840::/48
 2001:df4:cb00::/48
 2001:df4:cc00::/48
+2001:df4:ccc0::/48
 2001:df4:d380::/48
 2001:df4:d680::/48
 2001:df4:d780::/48