diff --git a/bacnet-stack/ports/atmega168/h_whois.c b/bacnet-stack/ports/atmega168/h_whois.c
new file mode 100644
index 00000000..28ff41d7
--- /dev/null
+++ b/bacnet-stack/ports/atmega168/h_whois.c
@@ -0,0 +1,64 @@
+/**************************************************************************
+*
+* Copyright (C) 2005 Steve Karg <skarg@users.sourceforge.net>
+*
+* Permission is hereby granted, free of charge, to any person obtaining
+* a copy of this software and associated documentation files (the
+* "Software"), to deal in the Software without restriction, including
+* without limitation the rights to use, copy, modify, merge, publish,
+* distribute, sublicense, and/or sell copies of the Software, and to
+* permit persons to whom the Software is furnished to do so, subject to
+* the following conditions:
+*
+* The above copyright notice and this permission notice shall be included
+* in all copies or substantial portions of the Software.
+*
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+*
+*********************************************************************/
+#include <stddef.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+#include "config.h"
+#include "txbuf.h"
+#include "bacdef.h"
+#include "bacdcode.h"
+#include "whois.h"
+#include "iam.h"
+#include "device.h"
+#include "client.h"
+#include "txbuf.h"
+
+void handler_who_is(uint8_t * service_request,
+    uint16_t service_len, BACNET_ADDRESS * src)
+{
+    int len = 0;
+    int32_t low_limit = 0;
+    int32_t high_limit = 0;
+
+    (void) src;
+    len = whois_decode_service_request(service_request,
+        service_len, &low_limit, &high_limit);
+    if (len == 0)
+        iam_send(&Handler_Transmit_Buffer[0]);
+    else if (len != -1) {
+        /* is my device id within the limits? */
+        if (((Device_Object_Instance_Number() >= (uint32_t) low_limit) &&
+                (Device_Object_Instance_Number() <= (uint32_t) high_limit))
+            ||
+            /* BACnet wildcard is the max instance number - everyone responds */
+            ((BACNET_MAX_INSTANCE >= (uint32_t) low_limit) &&
+                (BACNET_MAX_INSTANCE <= (uint32_t) high_limit)))
+            iam_send(&Handler_Transmit_Buffer[0]);
+    }
+
+    return;
+}