diff --git a/src/Tiny_httpd_io.ml b/src/Tiny_httpd_io.ml
index 64e376bf..507d9544 100644
--- a/src/Tiny_httpd_io.ml
+++ b/src/Tiny_httpd_io.ml
@@ -187,7 +187,7 @@ end
 (** A TCP server abstraction. *)
 module TCP_server = struct
   type conn_handler = {
-    handle: Input.t -> Output.t -> unit;  (** Handle client connection *)
+    handle: client_addr:Unix.sockaddr -> Input.t -> Output.t -> unit;  (** Handle client connection *)
   }
 
   type t = {
diff --git a/src/Tiny_httpd_server.ml b/src/Tiny_httpd_server.ml
index 17f5b364..a8b727d2 100644
--- a/src/Tiny_httpd_server.ml
+++ b/src/Tiny_httpd_server.ml
@@ -164,6 +164,7 @@ module Request = struct
   type 'body t = {
     meth: Meth.t;
     host: string;
+    client_addr: Unix.sockaddr;
     headers: Headers.t;
     http_version: int * int;
     path: string;
@@ -245,7 +246,7 @@ module Request = struct
         bad_reqf 400 "body is too short by %d bytes" size)
 
   (* parse request, but not body (yet) *)
-  let parse_req_start ~get_time_s ~buf (bs : byte_stream) :
+  let parse_req_start ~client_addr ~get_time_s ~buf (bs : byte_stream) :
       unit t option resp_result =
     try
       let line = Byte_stream.read_line ~buf bs in
@@ -281,6 +282,7 @@ module Request = struct
           meth;
           query;
           host;
+          client_addr;
           path;
           path_components;
           headers;
@@ -340,8 +342,8 @@ module Request = struct
     | e -> bad_reqf 500 "failed to read body: %s" (Printexc.to_string e)
 
   module Internal_ = struct
-    let parse_req_start ?(buf = Buf.create ()) ~get_time_s bs =
-      parse_req_start ~get_time_s ~buf bs |> unwrap_resp_result
+    let parse_req_start ?(buf = Buf.create ()) ~client_addr ~get_time_s bs =
+      parse_req_start ~client_addr ~get_time_s ~buf bs |> unwrap_resp_result
 
     let parse_body ?(buf = Buf.create ()) req bs : _ t =
       parse_body_ ~tr_stream:(fun s -> s) ~buf { req with body = bs }
@@ -918,14 +920,14 @@ module Unix_tcp_server_ = struct
           after_init tcp_server;
 
           (* how to handle a single client *)
-          let handle_client_unix_ (client_sock : Unix.file_descr) : unit =
+          let handle_client_unix_ (client_sock : Unix.file_descr) (client_addr : Unix.sockaddr) : unit =
             Unix.(setsockopt_float client_sock SO_RCVTIMEO self.timeout);
             Unix.(setsockopt_float client_sock SO_SNDTIMEO self.timeout);
             let oc =
               IO.Output.of_out_channel @@ Unix.out_channel_of_descr client_sock
             in
             let ic = IO.Input.of_unix_fd client_sock in
-            handle.handle ic oc;
+            handle.handle ~client_addr ic oc;
             _debug (fun k -> k "done with client, exiting");
             (try Unix.close client_sock
              with e ->
@@ -938,14 +940,14 @@ module Unix_tcp_server_ = struct
             (* limit concurrency *)
             Sem_.acquire 1 self.sem_max_connections;
             try
-              let client_sock, _ = Unix.accept sock in
+              let client_sock, client_addr = Unix.accept sock in
               Unix.setsockopt client_sock Unix.TCP_NODELAY true;
               (* Block INT/HUP while cloning to avoid children handling them.
                  When thread gets them, our Unix.accept raises neatly. *)
               ignore Unix.(sigprocmask SIG_BLOCK Sys.[ sigint; sighup ]);
               self.new_thread (fun () ->
                   try
-                    handle_client_unix_ client_sock;
+                    handle_client_unix_ client_sock client_addr;
                     Sem_.release 1 self.sem_max_connections
                   with e ->
                     (try Unix.close client_sock with _ -> ());
@@ -1015,7 +1017,7 @@ let find_map f l =
   aux f l
 
 (* handle client on [ic] and [oc] *)
-let client_handle_for (self : t) ic oc : unit =
+let client_handle_for (self : t) ~client_addr ic oc : unit =
   Pool.with_resource self.buf_pool @@ fun buf ->
   Pool.with_resource self.buf_pool @@ fun buf_res ->
   let is = Byte_stream.of_input ~buf_size:self.buf_size ic in
@@ -1023,7 +1025,7 @@ let client_handle_for (self : t) ic oc : unit =
   while !continue && running self do
     _debug (fun k -> k "read next request");
     let (module B) = self.backend in
-    match Request.parse_req_start ~get_time_s:B.get_time_s ~buf is with
+    match Request.parse_req_start ~client_addr ~get_time_s:B.get_time_s ~buf is with
     | Ok None -> continue := false (* client is done *)
     | Error (c, s) ->
       (* connection error, close *)
diff --git a/src/Tiny_httpd_server.mli b/src/Tiny_httpd_server.mli
index d9c8950e..b96c6a1d 100644
--- a/src/Tiny_httpd_server.mli
+++ b/src/Tiny_httpd_server.mli
@@ -67,6 +67,7 @@ module Request : sig
     meth: Meth.t;  (** HTTP method for this request. *)
     host: string;
         (** Host header, mandatory. It can also be found in {!headers}. *)
+    client_addr : Unix.sockaddr;  (** Client address. Available since NEXT_RELEASE. *)
     headers: Headers.t;  (** List of headers. *)
     http_version: int * int;
         (** HTTP version. This should be either [1, 0] or [1, 1]. *)
@@ -161,7 +162,7 @@ module Request : sig
   (* for testing purpose, do not use.  There is no guarantee of stability. *)
   module Internal_ : sig
     val parse_req_start :
-      ?buf:buf -> get_time_s:(unit -> float) -> byte_stream -> unit t option
+      ?buf:buf -> client_addr:Unix.sockaddr -> get_time_s:(unit -> float) -> byte_stream -> unit t option
 
     val parse_body : ?buf:buf -> unit t -> byte_stream -> byte_stream t
   end
diff --git a/tests/unit/t_server.ml b/tests/unit/t_server.ml
index ef85e9be..56dd77ff 100644
--- a/tests/unit/t_server.ml
+++ b/tests/unit/t_server.ml
@@ -10,7 +10,8 @@ let () =
      salutationsSOMEJUNK"
   in
   let str = Tiny_httpd.Byte_stream.of_string q in
-  let r = Request.Internal_.parse_req_start ~get_time_s:(fun _ -> 0.) str in
+  let client_addr = Unix.(ADDR_INET (inet_addr_loopback, 1024)) in
+  let r = Request.Internal_.parse_req_start ~client_addr ~get_time_s:(fun _ -> 0.) str in
   match r with
   | None -> failwith "should parse"
   | Some req ->