Root Access

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Michael

1:47 PM

@MiG Too broad, more of a discussion than question

SO is a QA site

MiG

2:12 PM

He could've done better removing the 'for example' from the last sentence I suppose

I get a bit annoyed by kids posing their homework questions as if they were their own tbh

Was curious about the answer in this very specific case though, I recall there being some ceremony around the last IPv4 block being assigned a long time ago, and clearly we're still around (and not even close to fully having moved over to IPv6)

2 hours later…

djsmiley2kStaysInside

3:59 PM

That's nothing to do with what's being asked tho

There's plenty of free IPv4 atm

you just have to have a very good reason to ask for it

And deep pockets

Classful subnets split the entire range of 0.0.0.0 - 255.255.255.255 into 3 sections, A, B and C

each had a specific fixed size

If a company used class A subnets everywhere, they'd rapidly use up huge chunks of the IP space, for very little benefit

by having CIDR instead, we can split up subnets into various sizes, sizing them more according to the use.

However, the student shows their entire non-understanding of this with the question

> For example, what is the average percentage utilization of a given subnet address space?

That's unanswerable

You could look at the utilized IPv4 space globally, vs what's allocated

but that's nothing to do with classful or classless subnetting, really.

We didn't allocate huge chunks to companies, because we only had classful subnets

7 hours later…