diff --git a/ipv6/sg.cidr b/ipv6/sg.cidr
index 4140928b5..ef00b9fac 100644
--- a/ipv6/sg.cidr
+++ b/ipv6/sg.cidr
@@ -141,6 +141,7 @@
 2001:df4:b180::/48
 2001:df4:b7c0::/48
 2001:df4:c140::/48
+2001:df4:c540::/48
 2001:df4:c800::/48
 2001:df4:dd00::/48
 2001:df4:e200::/48