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Calculating CIDR from ipaddress and subnet mask

  1. #1
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    Calculating CIDR from ipaddress and subnet mask

    First time post...

    I have a csv file that gets sent to me every month from our network folks. see below.

    The third column I currently put in manually however it is a pain since we have 1700 subnets to deal with. Can anyone help me populate the third column using the CIRD syntax. Even better, my ultimate solution would have the third column look like

    eg: 172.25.103.64/26
    172.25.11.0/24
    etc...

    The reason for the proper syntax is that I take this list and import it into my network scanning tool.

    monthly csv example
    172.25.103.64 255.255.255.192 /26
    172.25.104.0 255.255.255.192 /26
    172.25.104.128 255.255.255.128 /25
    172.25.104.64 255.255.255.192 /26
    172.25.105.0 255.255.255.192 /26
    172.25.105.128 255.255.255.128 /25
    172.25.105.64 255.255.255.192 /26
    172.25.11.0 255.255.255.0 /24
    172.25.12.0 255.255.255.0 /24
    172.25.13.0 255.255.255.0 /24
    172.25.14.0 255.255.255.0 /24
    172.25.143.0 255.255.255.128 /25
    172.25.148.0 255.255.255.0 /24
    172.25.15.0 255.255.255.0 /24
    172.25.150.0 255.255.255.192 /26
    172.25.150.128 255.255.255.192 /26
    172.25.150.192 255.255.255.192 /26
    172.25.150.64 255.255.255.192 /26
    172.25.151.0 255.255.255.192 /26
    172.25.151.128 255.255.255.192 /26

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    Re: Calculating CIDR from ipaddress and subnet mask

    The macro is not needed.
    Elements:
    1. The cidr table from https://en.wikipedia.org/wiki/Classl...Domain_Routing
    2. VLOOKUP function

    Import data, set the columns as in the example, insert the formula and copy it down.
    Attached Files Attached Files

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    Talking Re: Calculating CIDR from ipaddress and subnet mask

    That will save me MANY!!! hours. Thanks a lot.

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    Re: Calculating CIDR from ipaddress and subnet mask

    Thanks for the file ! It saved me a lot of time as well !

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    Re: Calculating CIDR from ipaddress and subnet mask

    Thank You ! This saved me a lot of time.

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    Re: Calculating CIDR from ipaddress and subnet mask

    Thank you! I see this was posted a while ago. Just stumbled on it now. You saved me a lot of time! Had over 7600 subnets to convert! Appreciate.

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    Re: Calculating CIDR from ipaddress and subnet mask

    Quote Originally Posted by mjr veverka View Post
    The macro is not needed.
    Elements:
    1. The cidr table from wikipedia
    2. VLOOKUP function

    Import data, set the columns as in the example, insert the formula and copy it down.
    Thank you Mjr! So beautiful and simple.

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