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diff --git a/src/include/gnunet_nt_lib.h b/src/include/gnunet_nt_lib.h
new file mode 100644
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+++ b/src/include/gnunet_nt_lib.h
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+/*
+ This file is part of GNUnet.
+ Copyright (C) 2010-2015, 2018 GNUnet e.V.
+
+ GNUnet is free software: you can redistribute it and/or modify it
+ under the terms of the GNU Affero General Public License as published
+ by the Free Software Foundation, either version 3 of the License,
+ 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
+ Affero General Public License for more details.
+
+ You should have received a copy of the GNU Affero General Public License
+ along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+/**
+ * @file network type characterization
+ * @author Christian Grothoff
+ * @author Matthias Wachs
+ *
+ * @defgroup nt  network type characterization
+ *
+ * @{
+ */
+#ifndef GNUNET_NT_LIB_H
+#define GNUNET_NT_LIB_H
+
+/**
+ * Types of networks (with separate quotas) we support.
+ */
+enum GNUNET_NetworkType
+{
+  /**
+   * Category of last resort.
+   */
+  GNUNET_NT_UNSPECIFIED = 0,
+
+  /**
+   * Loopback (same host).
+   */
+  GNUNET_NT_LOOPBACK = 1,
+
+  /**
+   * Local area network.
+   */
+  GNUNET_NT_LAN = 2,
+
+  /**
+   * Wide area network (i.e. Internet)
+   */
+  GNUNET_NT_WAN = 3,
+
+  /**
+   * Wireless LAN (i.e. 802.11abgn)
+   */
+  GNUNET_NT_WLAN = 4,
+
+  /**
+   * Bluetooth LAN
+   */
+  GNUNET_NT_BT = 5
+
+/**
+ * Number of network types supported by ATS
+ */
+#define GNUNET_NT_COUNT 6
+
+};
+
+
+/**
+ * Convert a `enum GNUNET_NetworkType` to a string
+ *
+ * @param net the network type
+ * @return a string or NULL if invalid
+ */
+const char *
+GNUNET_NT_to_string (enum GNUNET_NetworkType net);
+
+
+/**
+ * Handle for the LAN Characterization library.
+ */
+struct GNUNET_NT_InterfaceScanner;
+
+
+/**
+ * Returns where the address is located: loopback, LAN or WAN.
+ *
+ * @param is handle from #GNUNET_ATS_interface_scanner_init()
+ * @param addr address
+ * @param addrlen address length
+ * @return type of the network the address belongs to
+ */
+enum GNUNET_NetworkType
+GNUNET_NT_scanner_get_type (struct GNUNET_NT_InterfaceScanner *is,
+                            const struct sockaddr *addr,
+                            socklen_t addrlen);
+
+
+/**
+ * Initialize the address characterization client handle.
+ *
+ * @return scanner handle, NULL on error
+ */
+struct GNUNET_NT_InterfaceScanner *
+GNUNET_NT_scanner_init (void);
+
+
+/**
+ * Terminate interface scanner.
+ *
+ * @param is scanner we are done with
+ */
+void
+GNUNET_NT_scanner_done (struct GNUNET_NT_InterfaceScanner *is);
+
+
+#endif
+
+/** @} */  /* end of group */