diff --git a/ipv4/mx.cidr b/ipv4/mx.cidr
index f27680e3..76e98a08 100644
--- a/ipv4/mx.cidr
+++ b/ipv4/mx.cidr
@@ -516,6 +516,7 @@
 200.53.224.0/19
 200.56.0.0/15
 200.58.252.0/22
+200.63.40.0/21
 200.64.0.0/15
 200.66.0.0/18
 200.66.64.0/19