DNS requests appear to be random after startup or network properties change

This article provides some information about DNS requests that appear to be random after startup or network properties change.

Applies to:   Windows 10 - all editions
Original KB number:   4564934

Summary

You have a computer that runs Windows 8 or a later version, and has at least one network adapter that is configured as follows:

• The adapter is not connected to a domain network
• The adapter does not have a WINS server configured

After the computer starts or after a network property changes, you may observe that the computer sends out one or two DNS name resolution requests that appear to be random.

Cause

In certain circumstances, the Windows DNS client may send DNS name resolution requests that appear to be random. These requests serve various purposes, such as detecting network conditions. This Windows request behavior is subject to change.

More information

When the queries are sent by the Windows DNS client, no action is required. Blocking these queries may affect Windows performance.