diff --git a/synapse/handlers/admin.py b/synapse/handlers/admin.py
new file mode 100644
index 0000000000..687b343a1d
--- /dev/null
+++ b/synapse/handlers/admin.py
@@ -0,0 +1,62 @@
+# -*- coding: utf-8 -*-
+# Copyright 2014 OpenMarket Ltd
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from twisted.internet import defer
+
+from ._base import BaseHandler
+
+import logging
+
+
+logger = logging.getLogger(__name__)
+
+
+class AdminHandler(BaseHandler):
+
+ def __init__(self, hs):
+ super(AdminHandler, self).__init__(hs)
+
+ @defer.inlineCallbacks
+ def get_whois(self, user):
+ res = yield self.store.get_user_ip_and_agents(user)
+
+ d = {}
+ for r in res:
+ device = d.setdefault(r["device_id"], {})
+ session = device.setdefault(r["access_token"], [])
+ session.append({
+ "ip": r["ip"],
+ "user_agent": r["user_agent"],
+ "last_seen": r["last_seen"],
+ })
+
+ ret = {
+ "user_id": user.to_string(),
+ "devices": [
+ {
+ "device_id": k,
+ "sessions": [
+ {
+ # "access_token": x, TODO (erikj)
+ "connections": y,
+ }
+ for x, y in v.items()
+ ]
+ }
+ for k, v in d.items()
+ ],
+ }
+
+ defer.returnValue(ret)
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