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diff --git a/src/lib/dhcpsrv/cfg_hosts_util.h b/src/lib/dhcpsrv/cfg_hosts_util.h
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+++ b/src/lib/dhcpsrv/cfg_hosts_util.h
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+// Copyright (C) 2017 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 CFG_HOSTS_UTIL_H
+#define CFG_HOSTS_UTIL_H
+
+#include <cc/data.h>
+#include <dhcpsrv/subnet_id.h>
+
+namespace isc {
+namespace dhcp {
+
+/// @brief Utility class to represent host reservation configurations
+/// internally as a map keyed by subnet IDs, externally as a list Element.
+class CfgHostsList {
+public:
+
+    /// The type of the internal map
+    typedef std::map<SubnetID, isc::data::ElementPtr> CfgHostsMap;
+
+    /// @brief Internalize a list Element
+    ///
+    /// This method gets a list Element and builds the internal map from it.
+    ///
+    /// @param list the list Element
+    void internalize(isc::data::ConstElementPtr list);
+
+    /// @brief Externalize the map to a list Element
+    ///
+    /// @return a list Element representing all host reservations
+    isc::data::ElementPtr externalize() const;
+
+    /// @brief Add a host reservation to the map
+    void add(SubnetID id, isc::data::ElementPtr resv);
+
+    /// @brief Return the host reservations for a subnet ID
+    ///
+    /// @param id the subnet ID
+    /// @return a list Element with host reservations
+    isc::data::ConstElementPtr get(SubnetID id) const;
+
+private:
+    /// @brief The internal map
+    CfgHostsMap map_;
+};
+
+}
+}
+
+#endif // CFG_HOSTS_UTIL_H