diff --git a/ppf.py b/ppf.py
index c8d8683..13b2d5f 100755
--- a/ppf.py
+++ b/ppf.py
@@ -55,6 +55,11 @@ def fetch_contents(url):
 
 	return res
 
+def valid_port(proxy):
+	ip, port = proxy.split(':')
+	port = int(port)
+	return port > 0 and port < 65535
+
 _known_proxies = {}
 def insert_proxies(proxies, uri, sqlite, timestamp):
 	global _known_proxies
@@ -63,9 +68,12 @@ def insert_proxies(proxies, uri, sqlite, timestamp):
 		for k in known:
 			_known_proxies[k[0]] = True
 
-	new = [ (timestamp,i,3,0,0,0) for i in proxies if not i in _known_proxies ]
-	for i in new:
-		_known_proxies[i[1]] = True
+	new = []
+	for p in proxies:
+		if not p in _known_proxies:
+			if not valid_port(p): continue
+			new.append((timestamp,p,3,0,0,0))
+			_known_proxies[p] = True
 
 	if len(new):
 		sqlite.executemany('INSERT INTO proxylist (added,proxy,failed,tested,success_count,total_duration) VALUES (?,?,?,?,?,?)', new)