Remembering IP address Class Ranges and private address ranges. Tips please?

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Hi Guys,

I get the whole IP address principle, Network and host...ect.. yada yada yada. but I'm having a hard time committing to memory IP rages ie:

Class A = 1.0.0.0 to 126.0.0.0
Class B = 128.0.0.0 to 191.255.0.0
Class C = 192.0.1.0 to 223.255.255.0

private Range

10.0.0.0 -> 10.255.255.255
172.16.0.0 -> 172.31.255.255
192.168.0.0 -> 192.168.255.255

I can't seem to get it in my head! I think it is because I'm looking for a patten and an explanation why these number are these numbers?

For example.... Why is class A start with 1 and end with 126 but Class B start 128 and Finnish 191? So Class A gives you 126 possible combinations in the first Octet but class B only 63 and Class C just 31? there is no patten I can spot! Maths (or math if your an American) to me has always been about pattens. I cant seem to find one here so my brain is just not getting it.

Also Private IP's who picked these numbers and why and how can I mathematically work them out in the exam.

It makes my brain hurt! Help me out guys.
Thanks

 

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The address between A and B is the loopback address...yep the whole 127 range is reserved for loopback! The clue you're looking for is the amount of hosts and networks that each class allows. It's all about the subnet bit if I remember correctly. Look up subnetting.

Maths is not about patterns...it's about repetition! And subnetting is the same i.e. the more you do it the easier it gets!

 

Forgot this one, they were agreed by a standards body...you can't use maths to work them out. Just memorise them.

 

Have a look at the first octet whilst displayed in binary format and the range of numbers between.

A: 00000000 0 - 127
B: 10000000 128 - 191
C: 11000000 192 - 223

 

Thanks Guys,

I guess it is something I'm just going to have to try to remember. I guess if there was an easy way they would have covered it on the cause. I'm actually halfway there already. I guess I saw all the numbers and freaked out! Thanks for the input guys!

 

What exam will you be taking Mrth?

 

The private IP ranges didn't come up in either A+ exam I took, or even any of the practice material I used. Is it definitely on the syllabus?

As for remembering the other ranges; I didn't really need to learn the range of class C as I could easily recognise them from using them all the time for home networking. For A and B, I just remember that 127.0.0.1 is the loopback, so anything less is class A, and anything above (but not class C) is obviously class B.

Don't forget the exam is multiple choice, so as long as you feel confident you could recognise each one in a list, you'll be fine.

 

It really doesn't matter whether it's on the syllabus or not... you'll likely be using those private IP ranges for much of your IT career (if not all of it). Remember, you're not just studying to pass an exam... you're studying so that you can be a better tech. Sure, there are sometimes things that you learn that are nothing more than trivia... but this definitely isn't one of them.

 

I agree with your sentiments entirely. For now I guess we just try and remember the best we can, then, when we're using them all the time they hopefully become second nature

 

the tips in here work http://www.certforums.co.uk/forums/thread14500.html