diff --git a/src/conf.py b/src/conf.py
index 9082ffdc0..840908df5 100644
--- a/src/conf.py
+++ b/src/conf.py
@@ -1241,7 +1241,7 @@ registerGroup(supybot.servers, 'http')
 class IP(registry.String):
     """Value must be a valid IP."""
     def setValue(self, v):
-        if v and not utils.net.isIP(v):
+        if v and not all(map(utils.net.isIP, v.split())):
             self.error()
         else:
             registry.String.setValue(self, v)