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Windows 7: Subnet Mask in DNS Settings

01 Oct 2016   #1

Windows 7 Professional 64-bit
Subnet Mask in DNS Settings


I want to use an alternative DNS server to that of my provider.

The DNS addresses of the alternatives are listed, but not the 'Subnet Mask' which seems to be required in the Network Connections' TCP IPv4 dialogue.

Can I leave this blank or is it mandatory ?

My System SpecsSystem Spec
01 Oct 2016   #2

Windows 7 Pro 64 bit

There is no Subnet Mask setting in DNS configuration. There is only the IP address for the Primary and Secondary DNS servers.

The Subnet mask setting is for your own IP address if it is statically defined. Typically this would be assigned dynamically by your router or ISP. If a static IP is used the subnet mask is required.
My System SpecsSystem Spec
02 Oct 2016   #3

Windows 7 Professional 64-bit


You're absolutely right of course.

Sorry for the unnecessary thread.
My System SpecsSystem Spec


 Subnet Mask in DNS Settings

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