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diff --git a/iterator/iter_donotq.h b/iterator/iter_donotq.h
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+/*
+ * iterator/iter_donotq.h - iterative resolver donotqueryaddresses storage.
+ *
+ * Copyright (c) 2007, NLnet Labs. All rights reserved.
+ *
+ * This software is open source.
+ * 
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 
+ * Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 
+ * Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 
+ * Neither the name of the NLNET LABS nor the names of its contributors may
+ * be used to endorse or promote products derived from this software without
+ * specific prior written permission.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/**
+ * \file
+ *
+ * This file contains functions to assist the iterator module.
+ * Keep track of the donotquery addresses and lookup fast.
+ */
+
+#ifndef ITERATOR_ITER_DONOTQ_H
+#define ITERATOR_ITER_DONOTQ_H
+#include "util/storage/dnstree.h"
+struct iter_env;
+struct config_file;
+struct regional;
+
+/**
+ * Iterator donotqueryaddresses structure
+ */
+struct iter_donotq {
+	/** regional for allocation */
+	struct regional* region;
+	/** 
+	 * Tree of the address spans that are blocked.
+	 * contents of type addr_tree_node. Each node is an address span 
+	 * that must not be used to send queries to.
+	 */
+	rbtree_t tree;
+};
+
+/**
+ * Create donotqueryaddresses structure 
+ * @return new structure or NULL on error.
+ */
+struct iter_donotq* donotq_create(void);
+
+/**
+ * Delete donotqueryaddresses structure.
+ * @param donotq: to delete.
+ */
+void donotq_delete(struct iter_donotq* donotq);
+
+/**
+ * Process donotqueryaddresses config.
+ * @param donotq: where to store.
+ * @param cfg: config options.
+ * @return 0 on error.
+ */
+int donotq_apply_cfg(struct iter_donotq* donotq, struct config_file* cfg);
+
+/**
+ * See if an address is blocked.
+ * @param donotq: structure for address storage.
+ * @param addr: address to check
+ * @param addrlen: length of addr.
+ * @return: true if the address must not be queried. false if unlisted.
+ */
+int donotq_lookup(struct iter_donotq* donotq, struct sockaddr_storage* addr,
+	socklen_t addrlen);
+
+/**
+ * Get memory used by donotqueryaddresses structure.
+ * @param donotq: structure for address storage.
+ * @return bytes in use.
+ */
+size_t donotq_get_mem(struct iter_donotq* donotq);
+
+#endif /* ITERATOR_ITER_DONOTQ_H */