Tag Archives: Subnets

Calculating Subnets and CIDR Quickly

A friend of mine mentioned┬árecently that he has to work out subnet masks in his head for an exam and commented in reality he’d just use a subnet calculator. Whilst this is probably true, there’s a quick trick that might help if you’re calculating subnets under duress. This isn’t a full write up and offers no real explanation of why it works, it’s just pointing out a trick you may┬áhave missed which might come in handy one day!

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