diff --git a/ns-blacklist.txt b/ns-blacklist.txt
index d4e3155a11..472c138a31 100644
--- a/ns-blacklist.txt
+++ b/ns-blacklist.txt
@@ -48,3 +48,4 @@ status: NXDOMAIN
 .exmetis.com.
 .dnsever.com.
 .digitalocean.com.
+.ispapi.net.