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Top Forums Shell Programming and Scripting Convert ip ranges to CIDR netblocks Post 302996576 by rgopichand on Thursday 27th of April 2017 01:33:49 PM
Old 04-27-2017
Hi, I have list of IP's ~3k, which are from very small to large subnets. So, I want the IPs to be grouped into subnets that makes sense. The scenario is several groups get IP's based on availability and none of the group should not touch or scan the other IP's. We get the list of IPs based on manual inventory from each group and the key to this part is the provider doesn't manage which set of IPs belong to which group.
So the task is I collected manually all the IPs (which are around 3K) and want to make them into subnets to the nearest class. For example if I have a single IP address it should round off to /32 or if it has 4 ip's it should round off to /29 or /30. I have CIDR tools to do this task, but it needs manual input each time.

I'm looking for a way if I put the 3K ip's into excel or any format the script should round off to nearest subnet class.
 

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round(3M)						  Mathematical Library Functions						 round(3M)

NAME
round, roundf, roundl - round to nearest integer value in floating-point format SYNOPSIS
c99 [ flag... ] file... -lm [ library... ] #include <math.h> double round(double x); float roundf(float x); long double roundl(long double x); DESCRIPTION
These functions round their argument to the nearest integer value in floating-point format, rounding halfway cases away from 0, regardless of the current rounding direction. RETURN VALUES
Upon successful completion, these functions return the rounded integer value. If x is NaN, a NaN is returned. If x is +-0 or +- Inf, x is returned. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ |MT-Level |MT-Safe | +-----------------------------+-----------------------------+ SEE ALSO
feclearexcept(3M), fetestexcept(3M), math.h(3HEAD), attributes(5), standards(5) SunOS 5.11 12 Jul 2006 round(3M)
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