From the course: Learning Subnetting
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Calculating usable IPv4 address ranges
From the course: Learning Subnetting
Calculating usable IPv4 address ranges
- [Instructor] Alright, there's been a lot of buildup to this throughout this course, but now we're finally ready to tackle the big question. And that is, "how do we take a network, and a "given subnet mask, and from that calculate "the network address, the directed broadcast "address, and the usable IP addresses in that network, or in that subnet?" What IP addresses can we actually assign to a host? And then we're going to give you some terms in this video. I encourage you to take notes. But at a high level, here's what we're after. Let's say that we have a network of 172.25.0.0 /16. If we applied a 24-bit subnet mask to this, that would create 256 subnets. Remember two raised to the power of s, where s is the number of borrowed bits. Or in other words, if we borrow eight bits, and we extend this to a 24-bit mask, suddenly we've created 256 subnets. And it's fairly easy to visualize in this example what those subnets are, and how we would calculate them. We're simply counting by one,…
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