I have used a lot of these and now have a large project starting with a lot of layer 3 VLAN switches to configure.
Anyone got a preferred IP subnet calculator they can recommend?
              
              
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          this is the best you can use
You can download the freeware here:
Subnet Calculator
You can find many options such as
IP range, subnet mask calculation , Wildcard calculation
I use this online subnet calculator for a long time and works well :