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The ConvertIpv4MaskToLength function converts an IPv4 subnet mask to an IPv4 prefix length.
Syntax
IPHLPAPI_DLL_LINKAGE NETIOAPI_API ConvertIpv4MaskToLength(
[in] ULONG Mask,
[out] PUINT8 MaskLength
);
Parameters
[in] Mask
The IPv4 subnet mask.
[out] MaskLength
A pointer to a UINT8 value to hold the IPv4 prefix length, in bits, when the function returns successfully.
Return value
On success, ConvertIpv4MaskToLength returns NO_ERROR. Any nonzero return value indicates failure.
| Error code | Meaning |
|---|---|
|
One of the parameters was invalid. This error is returned if the Mask parameter was invalid. |
Remarks
The ConvertIpv4MaskToLength function is available on Windows Vista and later.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Windows Vista [desktop apps only] |
| Minimum supported server | Windows Server 2008 [desktop apps only] |
| Target Platform | Windows |
| Header | netioapi.h (include Iphlpapi.h) |
| Library | Iphlpapi.lib |
| DLL | Iphlpapi.dll |