DeleteIPAddress function (iphlpapi.h)

Article
10/13/2021

The DeleteIPAddress function deletes an IP address previously added using AddIPAddress.

Syntax

IPHLPAPI_DLL_LINKAGE DWORD DeleteIPAddress(
  [in] ULONG NTEContext
);

Parameters

[in] NTEContext

The Net Table Entry (NTE) context for the IP address. This context was returned by the previous call to AddIPAddress.

Return value

The function returns NO_ERROR (zero) if the function is successful.

If the function fails, the return value is one of the following error codes.

Return code	Description
ERROR_ACCESS_DENIED	Access is denied. This error is returned on Windows Vista and Windows Server 2008 under several conditions that include the following: the user lacks the required administrative privileges on the local computer or the application is not running in an enhanced shell as the built-in Administrator (RunAs administrator).
ERROR_INVALID_PARAMETER	An input parameter is invalid, no action was taken.
ERROR_NOT_SUPPORTED	The IPv4 transport is not configured on the local computer.
Other	Use FormatMessage to obtain the message string for the returned error.

Remarks

On Windows Vista and later, the DeleteIPAddress function can only be called by a user logged on as a member of the Administrators group. If DeleteIPAddress is called by a user that is not a member of the Administrators group, the function call will fail and ERROR_ACCESS_DENIED is returned. This function can also fail because of user account control (UAC) on Windows Vista and later. If an application that contains this function is executed by a user logged on as a member of the Administrators group other than the built-in Administrator, this call will fail unless the application has been marked in the manifest file with a requestedExecutionLevel set to requireAdministrator. If the application on Windows Vista and later lacks this manifest file, a user logged on as a member of the Administrators group other than the built-in Administrator must then be executing the application in an enhanced shell as the built-in Administrator (RunAs administrator) for this function to succeed.

Note On Windows NT 4.0 and Windows 2000 and later, this function executes a privileged operation. For this function to execute successfully, the caller must be logged on as a member of the Administrators group or the NetworkConfigurationOperators group.

Examples

The following example retrieves the IP address table, then adds the IP address 192.168.0.27 to the first adapter. The IP address that was added is then deleted.

#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN
#endif

#include <windows.h>
#include <winsock2.h>
#include <iphlpapi.h>
#include <stdio.h>
#include <stdlib.h>

#pragma comment(lib, "iphlpapi.lib")
#pragma comment(lib, "ws2_32.lib")

int main()
{
    // Declare and initialize variables
    PMIB_IPADDRTABLE pIPAddrTable;
    DWORD dwSize = 0;
    DWORD dwRetVal;

    // IP and mask we will be adding
    UINT iaIPAddress;
    UINT imIPMask;

    // Variables where handles to the added IP will be returned
    ULONG NTEContext = 0;
    ULONG NTEInstance = 0;

    LPVOID lpMsgBuf;


    // Before calling AddIPAddress we use GetIpAddrTable to get
    // an adapter to which we can add the IP.
    pIPAddrTable = (MIB_IPADDRTABLE *) malloc(sizeof (MIB_IPADDRTABLE));

    // Make an initial call to GetIpAddrTable to get the
    // necessary size into the dwSize variable
    if (GetIpAddrTable(pIPAddrTable, &dwSize, 0) == ERROR_INSUFFICIENT_BUFFER) {
        GlobalFree(pIPAddrTable);
        pIPAddrTable = (MIB_IPADDRTABLE *) malloc(dwSize);
    }
    // Make a second call to GetIpAddrTable to get the
    // actual data we want
    if ((dwRetVal = GetIpAddrTable(pIPAddrTable, &dwSize, 0)) == NO_ERROR) {
        printf("\tAddress: %ld\n", pIPAddrTable->table[0].dwAddr);
        printf("\tMask:    %ld\n", pIPAddrTable->table[0].dwMask);
        printf("\tIndex:   %ld\n", pIPAddrTable->table[0].dwIndex);
        printf("\tBCast:   %ld\n", pIPAddrTable->table[0].dwBCastAddr);
        printf("\tReasm:   %ld\n", pIPAddrTable->table[0].dwReasmSize);
    } else {
        printf("Call to GetIpAddrTable failed.\n");
    }

    // IP and mask we will be adding

    iaIPAddress = inet_addr("192.168.0.27");
    imIPMask = inet_addr("255.255.255.0");

    if ((dwRetVal = AddIPAddress(iaIPAddress,
                                 imIPMask,
                                 pIPAddrTable->table[0].dwIndex,
                                 &NTEContext, &NTEInstance)) == NO_ERROR) {
        printf("\tIP address added.\n");
    }

    else {
        printf("Error adding IP address.\n");

        if (FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS, NULL, dwRetVal, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),       // Default language
                          (LPTSTR) & lpMsgBuf, 0, NULL)) {
            printf("\tError: %s", lpMsgBuf);
        }
        LocalFree(lpMsgBuf);
    }

    // Delete the IP we just added using the NTEContext
    // variable where the handle was returned       
    if ((dwRetVal = DeleteIPAddress(NTEContext)) == NO_ERROR) {
        printf("\tIP Address Deleted.\n");
    } else {
        printf("\tCall to DeleteIPAddress failed.\n");
    }

    exit(0);

Requirements

Requirement	Value
Minimum supported client	Windows 2000 Professional [desktop apps only]
Minimum supported server	Windows 2000 Server [desktop apps only]
Target Platform	Windows
Header	iphlpapi.h
Library	Iphlpapi.lib
DLL	Iphlpapi.dll

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