diff --git a/ipv6/co.cidr b/ipv6/co.cidr
index 063f5702..1f08097f 100644
--- a/ipv6/co.cidr
+++ b/ipv6/co.cidr
@@ -317,6 +317,7 @@
 2801:1c1::/40
 2801:1c2::/44
 2801:1c4::/44
+2801:1c5::/40
 2801:1c6::/44
 2801:1c8::/36
 2801:1c9::/44