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

Discussion in 'A+' started by Mrth, Apr 24, 2010.

  1. Mrth

    Mrth New Member

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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
     
  2. drum_dude

    drum_dude Gigabyte Poster

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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!
     
    Certifications: MCSA , N+, A+ ,ITIL V2, MCTS
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  3. drum_dude

    drum_dude Gigabyte Poster

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    Forgot this one, they were agreed by a standards body...you can't use maths to work them out. Just memorise them.
     
    Certifications: MCSA , N+, A+ ,ITIL V2, MCTS
    WIP: MCITP 2008 Ent Admin, Server Admin, Exchange 2010, Lync 2010, CCNA & VCP5
  4. jk2447

    jk2447 Petabyte Poster Moderator

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    Sounds daft at 30 years of age but I remember things by making them fun :D
     
    Certifications: BSc (Hons), HND IT, HND Computing, ITIL-F, MBCS CITP, MCP (270,290,291,293,294,298,299,410,411,412) MCTS (401,620,624,652) MCSA:Security, MCSE: Security, Security+, CPTS, VCP4, CCA (XenApp6.5), MCSA 2012, VCP5, VCP6-NV
  5. billyr

    billyr Kilobyte Poster

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    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
     
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  6. Mrth

    Mrth New Member

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    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!
     
  7. drum_dude

    drum_dude Gigabyte Poster

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    What exam will you be taking Mrth?
     
    Certifications: MCSA , N+, A+ ,ITIL V2, MCTS
    WIP: MCITP 2008 Ent Admin, Server Admin, Exchange 2010, Lync 2010, CCNA & VCP5
  8. Carman

    Carman New Member

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    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.
     
    Certifications: A+
    WIP: MCP, CCNA, MSCE
  9. BosonMichael
    Highly Decorated Member Award

    BosonMichael Yottabyte Poster

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    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.
     
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  10. Carman

    Carman New Member

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    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 :)
     
    Certifications: A+
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  11. greenbrucelee
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    greenbrucelee Zettabyte Poster

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