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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) 2008-2019 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE 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.
+ */
+
+#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.
+ *
+ * @return iprt status code.
+ *
+ * @param pszAddress The IP address in CIDR specificaion.
+ * @param pNetwork The determined IP address / network.
+ * @param pNetmask The determined netmask.
+ */
+RTDECL(int) RTCidrStrToIPv4(const char *pszAddress, PRTNETADDRIPV4 pNetwork, PRTNETADDRIPV4 pNetmask);
+
+RT_C_DECLS_END
+/** @} */
+
+#endif /* !IPRT_INCLUDED_cidr_h */