Microsoft KB Archive/248629

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No WINS Reverse Lookup When Using RFC2317 Classless Delegation

Article ID: 248629

Article Last Modified on 2/28/2007


  • Microsoft Windows 2000 Server
  • Microsoft Windows 2000 Advanced Server
  • Microsoft Windows 2000 Datacenter Server
  • Microsoft Windows NT Server 4.0 Standard Edition

This article was previously published under Q248629


When you use RFC2317 classless delegation, WINS reverse lookup does not work for the delegated zone if the delegated zone resides on a different DNS server.


This issue can occur if you configure your DNS servers as described in the following Microsoft Knowledge Base article:

174419 How to Configure a Subnetted Reverse Lookup Zone on Windows NT


Classless delegation is a scheme to configure reverse IP address lookup.

Normally, a reverse IP address lookup for the address results in a DNS query for With classless delegation using a subnet mask of, this query may be substituted by a query for

When you configure WINS reverse lookup for the delegated subzone, the DNS server needs to determine the IP address from the query. With a query like, the server is unable to determine the corresponding IP address.

Keywords: kbnetwork kbprb KB248629