Microsoft KB Archive/248629

= No WINS Reverse Lookup When Using RFC2317 Classless In-Addr.arpa Delegation =

Article ID: 248629

Article Last Modified on 2/28/2007

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APPLIES TO


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

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This article was previously published under Q248629



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



CAUSE
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



MORE INFORMATION
Classless in-addr.arpa delegation is a scheme to configure reverse IP address lookup.

Normally, a reverse IP address lookup for the address 192.168.10.42 results in a DNS query for 42.10.168.192.in-addr.arpa. With classless in-addr.arpa delegation using a subnet mask of 255.255.255.192, this query may be substituted by a query for 42.0-26.10.168.192.in-addr.arpa.

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 42.0-26.10.168.192.in-addr.arpa., the server is unable to determine the corresponding IP address.

Keywords: kbnetwork kbprb KB248629

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