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CIDR notation help - allow IP range - Exch. Server 2007

Discussion in 'Web & Email' started by chronk, Apr 1, 2010.

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  1. chronk

    chronk Thread Starter

    May 24, 2007
    Need help with allow list for Exchange Server 2007.

    Need to allow an IP range - and do not know how to transfer the CIDR notation information into the IP range.
    Anyone know the math behind this?

    Specifically - I want to allow the IP range: to

    Would I enter ( not sure of the last number to enter to allow between 52.0.0 and 55.255.255.
    Or would I need to enter (nn = unknown -to me- number)
    Then etc - as i am unsure of the math - not sure if the 65.52 through 65.55 range can be expressed in one

    Found this reference
    "The CIDR notation would be written as

    Okay - so if the .0.0/24 ranges to .255.255.0 - then how would one bump up the last octet - from 0 to the desired 255?

    Thank You for looking!
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