diff --git a/ipv6/ec.cidr b/ipv6/ec.cidr
index c18fc7b64..df599a343 100644
--- a/ipv6/ec.cidr
+++ b/ipv6/ec.cidr
@@ -108,6 +108,7 @@
 2803:5fe0::/32
 2803:62c0::/32
 2803:6320::/32
+2803:6390::/32
 2803:6420::/32
 2803:6490::/32
 2803:6520::/32