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diff --git a/src/gns/gnunet-service-gns_reverser.h b/src/gns/gnunet-service-gns_reverser.h
new file mode 100644
index 000000000..ecec7d743
--- /dev/null
+++ b/src/gns/gnunet-service-gns_reverser.h
@@ -0,0 +1,72 @@
+/*
+     This file is part of GNUnet.
+     Copyright (C) 2009-2013 GNUnet e.V.
+
+     GNUnet is free software; you can redistribute it and/or modify
+     it under the terms of the GNU General Public License as published
+     by the Free Software Foundation; either version 3, or (at your
+     option) any later version.
+
+     GNUnet is distributed in the hope that it will be useful, but
+     WITHOUT ANY WARRANTY; without even the implied warranty of
+     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+     General Public License for more details.
+
+     You should have received a copy of the GNU General Public License
+     along with GNUnet; see the file COPYING.  If not, write to the
+     Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+     Boston, MA 02110-1301, USA.
+*/
+/**
+ * @file gns/gnunet-service-gns_reverser.h
+ * @brief GNUnet GNS service
+ * @author Martin Schanzenbach
+ */
+#ifndef GNS_REVERSER_H
+#define GNS_REVERSER_H
+#include "gns.h"
+#include "gnunet_gns_service.h"
+
+/**
+ * Handle for an active request.
+ */
+struct GNS_ReverserHandle;
+
+
+/**
+ * Function called with results for a GNS resolution.
+ *
+ * @param cls closure
+ * @param rd_count number of records in @a rd
+ * @param rd records returned for the lookup
+ */
+typedef void (*GNS_ReverseResultProcessor)(void *cls,
+                                           const char *name);
+
+
+/**
+ * Reverse lookup of a specific zone
+ * calls RecordLookupProcessor on result or timeout
+ *
+ * @param target the zone to perform the lookup in
+ * @param authority the authority
+ * @param proc the processor to call
+ * @param proc_cls the closure to pass to @a proc
+ * @return handle to cancel operation
+ */
+struct GNS_ReverserHandle *
+GNS_reverse_lookup (const struct GNUNET_CRYPTO_EcdsaPublicKey *target,
+                    const struct GNUNET_CRYPTO_EcdsaPublicKey *authority,
+                    GNS_ReverseResultProcessor proc,
+                    void *proc_cls);
+
+
+/**
+ * Cancel active resolution (i.e. client disconnected).
+ *
+ * @param rh resolution to abort
+ */
+void
+GNS_reverse_lookup_cancel (struct GNS_ReverserHandle *rh);
+
+#endif