diff --git a/parse_domain.py b/parse_domain.py
index 405b72c..b60be4b 100644
--- a/parse_domain.py
+++ b/parse_domain.py
@@ -8,33 +8,35 @@ def parse_domain(url, levels=2):
     """
     if levels < 1 or not url:
         return None
-        
+
     # Parse the hostname from the url
     parsed = urlparse(url)
-    hostname = getattr(parsed,'netloc',url)
-    
+    hostname = getattr(parsed,'hostname',url)
+
     partial_domains = []
     partial_domain = ""
+    if hostname is None:
+        return None
     for section in reversed(hostname.split(".")):
         partial_domain = "." + section + partial_domain
         partial_domains.append(partial_domain)
-        
+
     # Find the longest matching TLD, recording its index
     tld_idx = 0
     for idx, item in enumerate(partial_domains):
         if item in tlds:
             tld_idx = idx
-        
+
     # Add the desired number of levels to the tld index,
     # counting the TLD itself as the first level
     try:
         domain = partial_domains[tld_idx + levels - 1]
     except IndexError:
         domain = partial_domains[-1]
-    
+
     # Remove the initial dot
     return domain[1:]
-        
+
 tlds = set((
     '.2000.hu',
     '.ab.ca',
@@ -1576,7 +1578,7 @@ def parse_domain(url, levels=2):
 
 
 if __name__=="__main__":
-    for item in ['http://something.unknown','http://a.b.c.something.unknown','http://something','http://google.com','http://a.b.c.d.e.google.com','http://something.uk','http://aa.bb.cc.dd.ee.ff.gg.guardian.co.uk','http://guardian.co.uk','http://www.guardian.co.uk','http://www.google.com','http://wikipedia.org','http://www.wikipedia.org','',None,'whatever']:
+    for item in ['http://something.unknown','http://a.b.c.something.unknown','http://something','http://google.com','http://a.b.c.d.e.google.com','http://something.uk','http://aa.bb.cc.dd.ee.ff.gg.guardian.co.uk','http://guardian.co.uk','http://www.guardian.co.uk','http://www.google.com','http://wikipedia.org','http://www.wikipedia.org','http://www.example.com:1234','',None,'whatever']:
         for level in range(0,5):
             print "url=%s, levels=%s => %s" % (item, level, parse_domain(item,level))