diff --git a/pymispwarninglists/__init__.py b/pymispwarninglists/__init__.py
index 1ddde4a..36316a3 100644
--- a/pymispwarninglists/__init__.py
+++ b/pymispwarninglists/__init__.py
@@ -1,4 +1,4 @@
 #!/usr/bin/env python
 # -*- coding: utf-8 -*-
 
-from .api import WarningLists, EncodeWarningLists
+from .api import WarningLists, EncodeWarningList
diff --git a/pymispwarninglists/api.py b/pymispwarninglists/api.py
index 172edf6..a065b2d 100644
--- a/pymispwarninglists/api.py
+++ b/pymispwarninglists/api.py
@@ -15,12 +15,11 @@ except ImportError:
     HAS_JSONSCHEMA = False
 
 
-class EncodeWarningLists(JSONEncoder):
+class EncodeWarningList(JSONEncoder):
     def default(self, obj):
-        try:
-            return obj._json()
-        except AttributeError:
-            return JSONEncoder.default(self, obj)
+        if isinstance(obj, WarningList):
+            return obj.to_dict()
+        return JSONEncoder.default(self, obj)
 
 
 class PyMISPWarningListsError(Exception):
@@ -42,16 +41,19 @@ class WarningList():
         if self.warninglist.get('matching_attributes'):
             self.matching_attributes = self.warninglist['matching_attributes']
 
-    def _json(self):
-        to_return = {'list': self.list, 'name': self.name, 'description': self.description,
-                     'version': self.version}
+    def to_dict(self):
+        to_return = {'list': [str(e) for e in self.list], 'name': self.name,
+                     'description': self.description, 'version': self.version}
         if hasattr(self, 'type'):
             to_return['type'] = self.type
         if hasattr(self, 'matching_attributes'):
             to_return['matching_attributes'] = self.matching_attributes
         return to_return
 
-    def has_match(self, value):
+    def to_json(self):
+        return json.dumps(self.to_dict(), cls=EncodeWarningList)
+
+    def __contains__(self, value):
         if value in self.list:
             return True
         return False
@@ -87,8 +89,8 @@ class WarningLists(collections.Mapping):
     def search(self, value):
         matches = []
         for name, wl in self.warninglists.items():
-            if wl.has_match(value):
-                matches.append(wl)
+            if value in wl:
+               matches.append(wl)
         return matches
 
     def __len__(self):
diff --git a/tests/tests.py b/tests/tests.py
index 2dec739..19fcdaf 100644
--- a/tests/tests.py
+++ b/tests/tests.py
@@ -2,7 +2,7 @@
 # -*- coding: utf-8 -*-
 
 import unittest
-from pymispwarninglists import WarningLists, EncodeWarningLists
+from pymispwarninglists import WarningLists
 from glob import glob
 import os
 import json
@@ -20,7 +20,7 @@ class TestPyMISPWarningLists(unittest.TestCase):
                 warninglist = json.load(f)
             warninglists_from_files[warninglist['name']] = warninglist
         for name, w in self.warninglists.items():
-            out = w._json()
+            out = w.to_dict()
             self.assertDictEqual(out, warninglists_from_files[w.name])
 
     def test_validate_schema_warninglists(self):
@@ -28,4 +28,8 @@ class TestPyMISPWarningLists(unittest.TestCase):
 
     def test_json(self):
         for w in self.warninglists.values():
-            json.dumps(w, cls=EncodeWarningLists)
+            w.to_json()
+
+    def test_search(self):
+        results = self.warninglists.search('8.8.8.8')
+        self.assertEqual(results[0].name, 'List of known IPv4 public DNS resolvers')