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diff --git a/include/iprt/cidr.h b/include/iprt/cidr.h
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+/** @file
+ * IPRT - TCP/IP.
+ */
+
+/*
+ * Copyright (C) 2008-2022 Oracle and/or its affiliates.
+ *
+ * This file is part of VirtualBox base platform packages, as
+ * available from https://www.virtualbox.org.
+ *
+ * This program 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, in version 3 of the
+ * License.
+ *
+ * This program 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 this program; if not, see <https://www.gnu.org/licenses>.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
+ * in the VirtualBox distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ *
+ * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
+ */
+
+#ifndef IPRT_INCLUDED_cidr_h
+#define IPRT_INCLUDED_cidr_h
+#ifndef RT_WITHOUT_PRAGMA_ONCE
+# pragma once
+#endif
+
+#include <iprt/cdefs.h>
+#include <iprt/types.h>
+#include <iprt/net.h>
+
+/** @defgroup grp_rt_cidr   RTCidr - Classless Inter-Domain Routing notation
+ * @ingroup grp_rt
+ * @{
+ */
+RT_C_DECLS_BEGIN
+
+/**
+ * Parse a string which contains an IP address in CIDR (Classless
+ * Inter-Domain Routing) notation.
+ *
+ * @warning The network address and the network mask are returned in
+ *      @b host(!) byte order.  This is different from all the other
+ *      RTNetStrTo* functions.
+ *
+ * @deprecated This function is superseded by RTNetStrToIPv4Cidr()
+ *      that provides a better API consistent with other functions
+ *      from that family.  It returns the prefix length, if you need a
+ *      netmask, you can obtain it with RTNetPrefixToMaskIPv4().
+ *
+ * @return iprt status code.
+ *
+ * @param   pszAddress  The IP address in CIDR specificaion.
+ * @param   pNetwork    The determined IP address / network in host byte order.
+ * @param   pNetmask    The determined netmask in host byte order.
+ */
+RTDECL(int) RTCidrStrToIPv4(const char *pszAddress, PRTNETADDRIPV4 pNetwork, PRTNETADDRIPV4 pNetmask);
+
+RT_C_DECLS_END
+/** @} */
+
+#endif /* !IPRT_INCLUDED_cidr_h */