diff --git a/util/ipresolver/test/test_ipresolver.py b/util/ipresolver/test/test_ipresolver.py
index 705df89a9..8bb786308 100644
--- a/util/ipresolver/test/test_ipresolver.py
+++ b/util/ipresolver/test/test_ipresolver.py
@@ -18,7 +18,12 @@ def aws_ip_range_data():
         'ip_prefix': '10.0.0.0/8',
         'region': 'GLOBAL',
         'service': 'AMAZON',
-      } 
+      },
+      {
+        'ip_prefix': '6.0.0.0/8',
+        'region': 'GLOBAL',
+        'service': 'AMAZON',
+      },
     ],
   }
   return fake_range_doc
@@ -53,6 +58,7 @@ def test_resolved(aws_ip_range_data, test_ip_range_cache, test_aws_ip, app):
   with patch.dict('util.ipresolver.CACHE', test_ip_range_cache):
     assert ipresolver.resolve_ip(test_aws_ip) == ResolvedLocation(provider='aws', region=u'GLOBAL', service=None, sync_token=123456789, country_iso_code=None)
     assert ipresolver.resolve_ip('10.0.0.2') == ResolvedLocation(provider='aws', region=u'GLOBAL', service=None, sync_token=123456789, country_iso_code=None)
+    assert ipresolver.resolve_ip('6.0.0.2') == ResolvedLocation(provider='aws', region=u'GLOBAL', service=None, sync_token=123456789, country_iso_code=u'US')
     assert ipresolver.resolve_ip('1.2.3.4') == ResolvedLocation(provider='internet', region=u'NA', service=u'US', sync_token=123456789, country_iso_code=u'US')
     assert ipresolver.resolve_ip('127.0.0.1') == ResolvedLocation(provider='internet', region=None, service=None, sync_token=123456789, country_iso_code=None)