DhcpEnumSubnets function

The DhcpEnumSubnets function returns an enumerated list of subnets defined on the DHCP server.


  _In_    DHCP_CONST WCHAR   *ServerIpAddress,
  _Inout_ DHCP_RESUME_HANDLE *ResumeHandle,
  _In_    DWORD              PreferredMaximum,
  _Out_   LPDHCP_IP_ARRAY    *EnumInfo,
  _Out_   DWORD              *ElementsRead,
  _Out_   DWORD              *ElementsTotal


ServerIpAddress [in]

Unicode string that specifies the IP address or hostname of the DHCP server.

ResumeHandle [in, out]

Pointer to a DHCP_RESUME_HANDLE value that identifies the enumeration operation. Initially, this value should be zero, with a successful call returning the handle value used for subsequent enumeration requests. For example, if PreferredMaximum is set to 100, and 200 subnet addresses are stored on the server, the resume handle can be used after the first 100 subnets are retrieved to obtain the next 100 on a subsequent call, and so forth.

PreferredMaximum [in]

Specifies the preferred maximum number of subnet addresses to return. If the number of remaining unenumerated options is less than this value, then that amount will be returned.

EnumInfo [out]

Pointer to a DHCP_IP_ARRAY structure that contains the subnet IDs available on the DHCP server. If no subnets are defined, this value will be null.

ElementsRead [out]

Pointer to a DWORD value that specifies the number of subnet addresses returned in EnumInfo.

ElementsTotal [out]

Pointer to a DWORD value that specifies the number of subnets defined on the DHCP server that have not yet been enumerated.

Return value

This function returns ERROR_SUCCESS upon a successful call. If a call is made with the same ResumeHandle value and all items on the server have been enumerated, this method returns ERROR_NO_MORE_ITEMS with ElementsRead and ElementsTotal set to 0. Otherwise, it returns one of the DHCP Server Management API Error Codes.


When no longer needed, the resources consumed for the enumerated data, and all pointers containted within, should be released with DhcpRpcFreeMemory.

This function requires host byte ordering for all DHCP_IP_ADDRESS values in parameter structures.


Minimum supported client

None supported

Minimum supported server

Windows 2000 Server [desktop apps only]







See also