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You are designing a subnet mask for the 172.26.0.0 network. You want 26 subnets with up to 1800 hosts on each subnet. What subnet mask should you use? - Quora
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Subnet Mask Calculator
How to calculate a subnet mask from hosts and subnets | TechTarget
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How to calculate a subnet mask from hosts and subnets | TechTarget
Perform IP Address Calculations With Gip IP Address Calculator