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The gethostbyaddr function uses the WSALookupServiceBegin function to query SVCID_INET_HOSTNAMEBYADDR as the service class GUID. The host address is supplied as a dotted decimnal IPv4 string (for example, "192.9.200.120") in the lpszServiceInstanceName member of the WSAQUERYSET structure passed to the WSALookupServiceBegin function. The Ws2_32.dll specifies LUP_RETURN_BLOB and the name service provider places a HOSTENT structure in the blob (using offsets instead of pointers as described above). Name service providers should honor these other LUP_RETURN_* flags as well.
| Flag | Description |
|---|---|
| LUP_RETURN_NAME | Returns the h_name member from HOSTENT structure in lpszServiceInstanceName. |
| LUP_RETURN_ADDR | Returns addressing information from HOSTENT in CSADDR_INFO structures, port information is defaulted to zero. |
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