diff --git a/server/filter.py b/server/filter.py
index ab6adedc..0f17b57f 100644
--- a/server/filter.py
+++ b/server/filter.py
@@ -619,19 +619,19 @@ class DNSUtils:
 	#@staticmethod
 	def isValidIP(string):
 		# Return true if str is a valid IP
-            	s = string.split('/', 1)
-          	# try to convert to ipv4
-          	try:
-      			socket.inet_aton(s[0])
-      			return True
-    		except socket.error:
-    			# if it had failed try to convert ipv6
-    			try:  
-            			socket.inet_pton(socket.AF_INET6, s[0])
-          			return True
-        		except socket.error: 
-    				# not a valid address in both stacks
-          			return False
+		s = string.split('/', 1)
+		# try to convert to ipv4
+		try:
+			socket.inet_aton(s[0])
+			return True
+		except socket.error:
+			# if it had failed try to convert ipv6
+			try:
+				socket.inet_pton(socket.AF_INET6, s[0])
+				return True
+			except socket.error:
+				# not a valid address in both stacks
+				return False
 	isValidIP = staticmethod(isValidIP)
 
 	#@staticmethod