Error in the tutorials...

Hey guys, just wanted to point out an error in the subnetting tutorials...
Its a minor thing but could confuse some people.
In the 'subnetmasks and their effect' page, where it lists the classed ip ranges, it states that class A is 1.0.0.0 to 127.255.255.255. shouldnt this be 126.255.255.255? (with range 127.0.0.0 to 127.255.255.255 being reserved for loopbacks and all).
Or is it actually still considered a class A? Is it down to the binary placement in the Subnet mask? (128 being another network).

OMG :shock: I've never looked at it that way before. That makes all the other classes beginning and end addresses make sense! lol!

Cheers!

As far as I'm aware, 127.x.y.z is, technically, a class A address.

The way I look at it is when you examine the first octet:

if it starts 01xxxxxx, it's class A
if it starts 10xxxxxx, it's class B
if it starts 110xxxxx, it's class C
if it starts 1110xxxx, it's class D
if it starts 11110xxx, it's class E

I'm fairly sure that 0.x.y.z can't be used and, as you say, 127.x.y.z are all loopback.

I hope that I'm not talking out of my rear end!

Steve, thats how i understand it also.

Hey that was a nice tutorial. I think adding the below would further clarify some facts....

itknowledgeexchange.techtarget.com/cisco...gical-and-operation/