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Subnetting question

Discussion in 'General Cisco Certifications' started by blang008, Jul 31, 2009.

  1. blang008

    blang008 New Member

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    What is the first valid host on the subnetwork that the node 192.168.145.246/28 belongs to?


    I know how to find the subnet mask, increment, and network ranges. My question is: Is there a quick way to find what network range 192.168.145.246 belongs to?
     
    Certifications: A+ Network+ DCSE
    WIP: CCENT/CCNA
  2. morph

    morph Byte Poster

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    I think with that particular one - if your increments 16 - work backwards with that one as its 246 - so .241 - .254
     
    Certifications: Network +, ITIL Foundation, CCENT, CCNA
    WIP: server/ccna security
  3. pete.grant

    pete.grant Byte Poster

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    Hi Blang,

    I recommend the following site:

    http://www.subnetting-secrets.com/index.html

    I have read/watched many guides on subnetting, all of which were really difficult to understand. The method explained by this site is fantastic. To buy the entire guide + videos is approx £17.
     
    Certifications: A+ IT Technician, CCENT, CEH, CPTS, CIW Security Analyst, ITIL v3 Foundation, Master CIW Administrator, MCITP (Windows Server 2008:SA), MCSA on Windows Server 2008, MCSA:Security on Windows Server 2003, MCTS (70-648, 70-652), Network+, SCNS, Security+, Server+
  4. soundian

    soundian Gigabyte Poster

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    Write it out in binary=easy
    do it often enough=p*ss easy

    EDIT: You also need to know your subnet mask. You can't work it out from an IP address because it could be classless rather than classful. You could assume but...
     
    Certifications: A+, N+,MCDST,MCTS(680), MCP(270, 271, 272), ITILv3F, CCENT
    WIP: Knuckling down at my new job
  5. bluelambda

    bluelambda New Member

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    There are probably a million and one ways to do this and everybody has their own. You have to find your own way :biggrin

    The way I do it is use /24 as a reference point
    /24 -> 1 network x 256 hosts
    /25 -> 2 x 128
    /26 -> 4 x 64
    /27 -> 8 x 32
    /28 -> 16 x 16

    work backworks from 256-16=240 which is the network address
    so .241 is the first host.
     
    Certifications: CCNA, CCNP, F5 SE (LTM)

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