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  1. #1
    Amir's Avatar
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    What is the Custom subnet mask for this ip?

    Custom Subnet mask for 178.100.0.0 we need 15usable hosts and 2000usable subnets!
    Its only for educational purpose! (Subnet mask exercises) thanks for all answers!

  2. #2
    Richard's Avatar
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    178.100.0.0 is generally regarded a class B address, so it will have 2^16 addresses.

    For 2000 sub-nets, you will have to sub-divide the class B address into 2048 sub-nets or 2^11 sub-nets. This will leave you 2^5 addresses in each sub-net.

    The mask will be 255.255.255.224.

    Note: This address range is also used on the public Internet, and the address range is allocated to t-mobile.co.uk. If you use these addresses for a private sub-net they will not be able to work with t-mobile devices using the same address range. Also, you must make sure that you do not allow these addresses to reach the public Internet.

 

 

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