diff --git a/validation/dns.md b/validation/dns.md
index 53d599c..0fb4a93 100644
--- a/validation/dns.md
+++ b/validation/dns.md
@@ -1,9 +1 @@
 # DNS Configuration Issues
-
-### Cache snooping
-host -r www.google.com <nameserverIP>
-
-### Open DNS resolution against a DNS server.
-Supply a hostname not cached or inside a company owned domain.
-
-nslookup www.nsa.gov <nameserverIP>