diff --git a/synapse/api/auth.py b/synapse/api/auth.py

index 66639b0089..088b4e8b6d 100644
--- a/synapse/api/auth.py
+++ b/synapse/api/auth.py
@@ -19,6 +19,7 @@ from six import itervalues
 
 import pymacaroons
 from twisted.internet import defer
+from netaddr import IPAddress
 
 import synapse.types
 from synapse import event_auth
@@ -244,6 +245,11 @@ class Auth(object):
         if app_service is None:
             defer.returnValue((None, None))
 
+        if app_service.ip_range_whitelist:
+            ip_address = IPAddress(self.hs.get_ip_from_request(request))
+            if ip_address not in app_service.ip_range_whitelist:
+                defer.returnValue((None, None))
+
         if "user_id" not in request.args:
             defer.returnValue((app_service.sender, app_service))
 
@@ -488,7 +494,7 @@ class Auth(object):
     def _look_up_user_by_access_token(self, token):
         ret = yield self.store.get_user_by_access_token(token)
         if not ret:
-            logger.warn("Unrecognised access token - not in store: %s" % (token,))
+            logger.warn("Unrecognised access token - not in store.")
             raise AuthError(
                 self.TOKEN_NOT_FOUND_HTTP_STATUS, "Unrecognised access token.",
                 errcode=Codes.UNKNOWN_TOKEN
@@ -511,7 +517,7 @@ class Auth(object):
             )
             service = self.store.get_app_service_by_token(token)
             if not service:
-                logger.warn("Unrecognised appservice access token: %s" % (token,))
+                logger.warn("Unrecognised appservice access token.")
                 raise AuthError(
                     self.TOKEN_NOT_FOUND_HTTP_STATUS,
                     "Unrecognised access token.",