diff --git a/ipv6/zz.cidr b/ipv6/zz.cidr
index 2183c5adc..0bc4760c1 100644
--- a/ipv6/zz.cidr
+++ b/ipv6/zz.cidr
@@ -218,7 +218,7 @@
 2001:43f8:c2::/47
 2001:43f8:c4::/46
 2001:43f8:c8::/45
-2001:43f8:d0::/48
+2001:43f8:d0::/44
 2001:43f8:e1::/48
 2001:43f8:e2::/47
 2001:43f8:e4::/46