Saturday, February 7, 2009

DisableAutoReverseZones Registry Key

This registry key determines whether to create reverse lookup dns zones automatically or not.
Automatically creating reverse lookup zones is a useful and optimized dns feature. If reverse lookup zones are created automatically, then the authoritative server can avoid recursive queries for most of the common dns queries.

By default, the DNS server is generally authoritative for the following three reverse lookup zones:

1. (
2. ( - loopback).
3. (255. 255. 255. 255 - broadcast).

Key Name: DisableAutoReverseZones
Default value: 0 (Creates three reverse lookupzones specified above automatically).
Functionality: Allow/disallow DNS Server to create standard dns reverse lookup zones automatically.
Location: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\dns\parameters.

Note: 1. DNS by default, does not add the DisableAutoReverseZones reg entry in to the registry. One can add to registry directly or by using the command Dnscmd.exe.
2. In both the above cases, dns server should restarted in make the changes effective. This is due to the fact that dns server creates reverse lookup zones during the startup.

Relevant Posts:
Enable or Disable disableautoreversezones on command prompt .


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