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diff --git a/src/lib/dhcpsrv/subnet_selector.h b/src/lib/dhcpsrv/subnet_selector.h
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+// Copyright (C) 2014-2016 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef SUBNET_SELECTOR_H
+#define SUBNET_SELECTOR_H
+
+#include <asiolink/io_address.h>
+#include <dhcp/classify.h>
+#include <dhcp/option.h>
+#include <string>
+
+namespace isc {
+namespace dhcp {
+
+/// @brief Subnet selector used to specify parameters used to select a subnet.
+///
+/// This structure holds various parameters extracted from a packet sent
+/// by a DHCP client used to select the subnet for the client. This selector
+/// is common for IPv4 and IPv6 subnets.
+struct SubnetSelector {
+    /// @name DHCPv4 specific parameters.
+    //@{
+    /// @brief ciaddr from the client's message.
+    asiolink::IOAddress ciaddr_;
+    /// @brief giaddr from the client's message.
+    asiolink::IOAddress giaddr_;
+    /// @brief RAI link select or subnet select option
+    asiolink::IOAddress option_select_;
+    //@}
+
+    /// @name DHCPv6 specific parameters.
+    //@{
+    /// @brief Interface id option.
+    OptionPtr interface_id_;
+    /// @brief First relay link address.
+    asiolink::IOAddress first_relay_linkaddr_;
+    //@}
+
+    /// @brief Address on which the message was received.
+    asiolink::IOAddress local_address_;
+    /// @brief Source address of the message.
+    asiolink::IOAddress remote_address_;
+    /// @brief Classes that the client belongs to.
+    ClientClasses client_classes_;
+    /// @brief Name of the interface on which the message was received.
+    std::string iface_name_;
+
+    /// @brief Specifies if the packet is DHCP4o6
+    bool dhcp4o6_;
+
+    /// @brief Default constructor.
+    ///
+    /// Sets the default values for the @c Selector.
+    SubnetSelector()
+        : ciaddr_(asiolink::IOAddress("0.0.0.0")),
+          giaddr_(asiolink::IOAddress("0.0.0.0")),
+          option_select_(asiolink::IOAddress("0.0.0.0")),
+          interface_id_(),
+          first_relay_linkaddr_(asiolink::IOAddress("::")),
+          local_address_(asiolink::IOAddress("0.0.0.0")),
+          remote_address_(asiolink::IOAddress("0.0.0.0")),
+          client_classes_(), iface_name_(std::string()),
+          dhcp4o6_(false) {
+    }
+};
+
+
+}
+}
+
+#endif // SUBNET_SELECTOR_H