diff --git a/synapse/http/agent_name.py b/synapse/http/agent_name.py
new file mode 100644
index 000000000..c98024b6a
--- /dev/null
+++ b/synapse/http/agent_name.py
@@ -0,0 +1,18 @@
+# -*- 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 synapse import __version__
+
+AGENT_NAME = ("Synapse/%s" % (__version__,)).encode("ascii")
diff --git a/synapse/http/client.py b/synapse/http/client.py
index 048a42890..11d6d9cb2 100644
--- a/synapse/http/client.py
+++ b/synapse/http/client.py
@@ -14,6 +14,7 @@
 # limitations under the License.
 
 
+from synapse.http.agent_name import AGENT_NAME
 from twisted.internet import defer, reactor
 from twisted.web.client import (
     Agent, readBody, FileBodyProducer, PartialDownloadError
@@ -51,7 +52,8 @@ class SimpleHttpClient(object):
             "POST",
             uri.encode("ascii"),
             headers=Headers({
-                "Content-Type": ["application/x-www-form-urlencoded"]
+                b"Content-Type": [b"application/x-www-form-urlencoded"],
+                b"User-Agent": AGENT_NAME,
             }),
             bodyProducer=FileBodyProducer(StringIO(query_bytes))
         )
@@ -86,6 +88,9 @@ class SimpleHttpClient(object):
         response = yield self.agent.request(
             "GET",
             uri.encode("ascii"),
+            headers=Headers({
+                b"User-Agent": AGENT_NAME,
+            })
         )
 
         body = yield readBody(response)
@@ -108,7 +113,8 @@ class CaptchaServerHttpClient(SimpleHttpClient):
             url.encode("ascii"),
             bodyProducer=FileBodyProducer(StringIO(query_bytes)),
             headers=Headers({
-                "Content-Type": ["application/x-www-form-urlencoded"]
+                b"Content-Type": [b"application/x-www-form-urlencoded"],
+                b"User-Agent": AGENT_NAME,
             })
         )
 
diff --git a/synapse/http/matrixfederationclient.py b/synapse/http/matrixfederationclient.py
index 8f4db59c7..fc371155a 100644
--- a/synapse/http/matrixfederationclient.py
+++ b/synapse/http/matrixfederationclient.py
@@ -20,6 +20,7 @@ from twisted.web.client import readBody, _AgentBase, _URI
 from twisted.web.http_headers import Headers
 from twisted.web._newclient import ResponseDone
 
+from synapse.http.agent_name import AGENT_NAME
 from synapse.http.endpoint import matrix_federation_endpoint
 from synapse.util.async import sleep
 from synapse.util.logcontext import PreserveLoggingContext
@@ -71,6 +72,7 @@ class MatrixFederationHttpClient(object):
             requests.
     """
 
+
     def __init__(self, hs):
         self.hs = hs
         self.signing_key = hs.config.signing_key[0]
@@ -83,7 +85,7 @@ class MatrixFederationHttpClient(object):
                         query_bytes=b"", retry_on_dns_fail=True):
         """ Creates and sends a request to the given url
         """
-        headers_dict[b"User-Agent"] = [b"Synapse"]
+        headers_dict[b"User-Agent"] = [AGENT_NAME]
         headers_dict[b"Host"] = [destination]
 
         url_bytes = urlparse.urlunparse(
diff --git a/synapse/http/server.py b/synapse/http/server.py
index f33859cf7..5765dffe3 100644
--- a/synapse/http/server.py
+++ b/synapse/http/server.py
@@ -14,14 +14,16 @@
 # limitations under the License.
 
 
-from syutil.jsonutil import (
-    encode_canonical_json, encode_pretty_printed_json
-)
+from synapse.http.agent_name import AGENT_NAME
 from synapse.api.errors import (
     cs_exception, SynapseError, CodeMessageException
 )
 from synapse.util.logcontext import LoggingContext
 
+from syutil.jsonutil import (
+    encode_canonical_json, encode_pretty_printed_json
+)
+
 from twisted.internet import defer, reactor
 from twisted.web import server, resource
 from twisted.web.server import NOT_DONE_YET
@@ -230,6 +232,7 @@ def respond_with_json_bytes(request, code, json_bytes, send_cors=False,
 
     request.setResponseCode(code, message=response_code_message)
     request.setHeader(b"Content-Type", b"application/json")
+    request.setHeader(b"Server", AGENT_NAME)
 
     if send_cors:
         request.setHeader("Access-Control-Allow-Origin", "*")