diff --git a/tools/dnsquery.rb b/tools/dnsquery.rb
new file mode 100755
index 0000000..28752d6
--- /dev/null
+++ b/tools/dnsquery.rb
@@ -0,0 +1,33 @@
+#!/usr/bin/env ruby
+require 'domainatrix'
+
+def get_ip_of_host(host)
+  require 'socket'
+  ip = Socket.getaddrinfo(host, nil)
+  return nil if !ip || !ip[0] || !ip[0][2]
+  ip[0][2]
+rescue => e
+  nil
+end
+
+def get_root_of_host(host)
+  begin
+    url = Domainatrix.parse(host)
+    if url.domain && url.public_suffix
+      return url.domain+'.'+url.public_suffix
+    end
+  rescue => e
+    return nil
+  end
+end
+
+STDOUT.sync = true
+while host = gets
+  host = host.strip
+  break unless host && host.size>1
+  ip = get_ip_of_host(host)
+  next unless ip
+  rootdomain = get_root_of_host(host)
+  #break unless rootdomain
+  puts host+"\t"+rootdomain+"\t"+ip
+end