diff --git a/check_extended_dns.py b/check_extended_dns.py
old mode 100755
new mode 100644
index d2b8d14..4f6d3f0
--- a/check_extended_dns.py
+++ b/check_extended_dns.py
@@ -3,16 +3,37 @@
 import pythonwhois
 import argparse
 import sys
+import itertools
 
 parser = argparse.ArgumentParser(description='Check whois and dns information.')
 parser.add_argument('--domain', nargs=1, required=True, help='the domain name')
-parser.add_argument('--nameserver', nargs='*', help='a space delimited list of nameservers')
-
+parser.add_argument('--nameserver', nargs='+', help='a space delimited list of nameservers')
 args = parser.parse_args()
 
+nsargs = args.nameserver
+# how many ns servers should we expect?
+nsargscount = len(nsargs)
+
 try:
-    domain = pythonwhois.get_whois(args.domain[0])
+    whois = pythonwhois.get_whois(args.domain[0])
+    whoiscount = []
     
+    for key, value in whois.iteritems():
+        if key == "nameservers":
+            whoiscount.append(value)
 except:
     #something happened, raise an erro
-    print "3 Unexpected error: ", sys.exc_info()[0]
\ No newline at end of file
+    print "3 Unexpected_error: ", sys.exc_info()[0]
+
+# how many nameservers did whois return?
+#whoiscount = reduce(lambda x,y: x.extend(y),whoiscount)
+#print whoiscount
+nscount = list(itertools.chain.from_iterable(whoiscount))
+# print len(nscount)
+
+if len(nscount) < nsargscount:
+   print("2 Extended_DNS_Check CRITICAL - WHOIS DNS servers do not match provided DNS nameservers.")
+elif len(nscount) > nsargscount:
+   print("1 Extended_DNS_Check WARNING - WHOIS DNS servers do not match. There are more DNS servers from the WHOIS datbase than in your query.")
+else:
+   print("0 Extended_DNS_Check OK - all DNS server match")
\ No newline at end of file