Catch-all or super-subnet in sites and services

Catch-all or super-subnet in sites and services

This is one of the small things that sometimes drag my attention.

A customer once asked me if it was possible to create a subnet in Active Directory that would catch all clients, and then still have some individual subnets defined for exceptions.

I must confess that I didn’t know so I decided to try, but have never had a chance to report the result on the blog.

I created to sites SiteA and SiteB and created a DC in boot sites, then I created on subnet to catch all clients using ip addresses in 10.*.*.* pointing to SiteA:


Then I created a new subnet for a smaller subnet which was a subset of the catch-all subnet and pointed this to SiteB.


All clients clients on 10.*.*.* used SiteA except clients on 10.5.5.* which used SiteB as I had hoped for.

So it looks like it is possible to have a kind of wildcard subnet to catch all subnet that you might get in the future and decide the default site for those new subnets.

The use of the catch-all subnet will off course depend on your IP-addresses in use, and still require subnets to be created if the default Site is not the right one.

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Modern Workplace consultant and a Microsoft MVP in Enterprise Mobility.
Modern Workplace consultant and a Microsoft MVP in Windows and Devices for IT.

Infrastructure architect with focus on Modern Workplace and Microsoft 365 security.

Cloud & security specialist with focus on Microsoft backend products and cloud technologies.

Cloud & Security Specialist, with a passion for all things Cybersecurity

Cloud and infrastructure security specialist with background in networking.

Infrastructure architect with focus on design, implementation, migration and consolidation.

Infrastructure consultant with focus on cloud solutions in Office365 and Azure.

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