DOCUMENT:Q138086 08-AUG-2001 [winnt] TITLE :Windows NT 3.51: Reverse Name Resolution for WINS Clients PRODUCT :Microsoft Windows NT PROD/VER:3.51 4.0 OPER/SYS: KEYWORDS:kbnetwork ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Windows NT Workstation versions 3.51, 4.0 - Microsoft Windows NT Server versions 3.51, 4.0 ------------------------------------------------------------------------------- SUMMARY ======= Windows NT version 3.51 TCP/IP includes a new feature that allows a host to find out the computer name (host name) that matches a TCP/IP address; this is possible even if DHCP is being used to dynamically assign TCP/IP addresses. MORE INFORMATION ================ Windows Sockets programs use the GetHostByAddr() call to resolve a TCP/IP address to a computer name. To accomplish this resolution, the Windows NT 3.51 GetHostByAddr() first attempts to look up the computer name by contacting a domain name server (DNS), if one is configured. If the DNS lookup does not return a host name, then GetHostByAddr() attempts to resolve the TCP/IP address to a computer name by using a NetBIOS Node Status Request as defined in RFC1001/1002. NetBIOS nodes return their name table in response. The GetHostByAddr() routine parses the name table for the computer name and returns this to the caller. This method does not work for hosts that are not NetBIOS-capable. PTR records (that is address-to-name records) must be added to the DNS for these computers. Windows NT utility programs such as PING.EXE, TRACERT.EXE, and NETSTAT.EXE use GetHostByAddr(), so they can take advantage of this feature. Additional query words: prodnt IP tcp tcpip ====================================================================== Keywords : kbnetwork Technology : kbWinNTsearch kbWinNTWsearch kbWinNTW400 kbWinNTW400search kbWinNT351search kbWinNT400search kbWinNTW351search kbWinNTW351 kbWinNTSsearch kbWinNTS400search kbWinNTS400 kbWinNTS351 kbWinNTS351search Version : 3.51 4.0 ============================================================================= THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY. Copyright Microsoft Corporation 2001.