RE: emulation of gethostbyaddr to resolve to NetBIOS name

From: ("Charles Wang [MSFT]")
Fri, 09 May 2008 05:20:37 GMT
Hi Paul,
I understand that you would like to know how to get a NetBIOS name from an
IP address by using NetBIOS API.
If I have misunderstood, please let me know.

From my research, you can use NetBIOS API to retrieve host names and MAC
addresses of the network adapters, however to retrieve NetBIOS name from an
IP address, you need to use the WinSock API gethostbyaddr instead of
NetBIOS API. From this article,, we can also
find the following descriptions:
"Developers requiring NetBIOS name resolution may need to use gethostbyaddr
until their applications are completely independent of NetBIOS names."

You can retrieve the Netbios name from an IP address with the following
unsigned long res;
WSADATA wsaData;

res = inet_addr(ip);
if ((res == INADDR_NONE) || (res == 0)) {
    strcpy(host, "unable to resolve");
    return false;

if (WSAStartup(MAKEWORD(1, 1), &wsaData)) {
    strcpy(host, "unable to resolve");
    return false;

pHost = gethostbyaddr((char*)&res, sizeof(res), AF_NETBIOS);
if (pHost == NULL) {
    MessageBox("unable to resolve");
    return false;

Also I do not recommend that you use NetBios API since Netbios is not
available for use on Windows Vista, Windows Server 2008, and subsequent
versions of the operating system. You can find the clarification in this
Netbios Function

If you want to get Network parameters information, I would recommend that
you use IP Helper functions and Winsock functions such as GetAdaptersInfo
and gethostbyaddr. You may also refer to this article for more information:
Review of the network adapter parameters

Hope this helps. If you have any other questions or concerns, please feel
free to let me know.

Have a nice day!

Best regards,
Charles Wang
Microsoft Online Community Support
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