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Get IP list from CIDR

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# 1  
Old 01-09-2007
Get IP list from CIDR
Dear Srs :-)

I'm looking for a shell script, that given a network in CIDR format it lists all IPs, for example:

Quote:
$ script 192.168.0.0/24
192.168.0.1
192.168.0.2
192.168.0.3
192.168.0.4
...
Preferredly a shell script, but a Perl, Python, C, etc.. is also welcome :-)

I have been looking in sipcalc, ipcalc, etc.. options but this feature is not implemented :-(

Regards,
# 2  
Old 01-09-2007
Code:
ip=$( echo $1 | cut -d"/" -f1 )
no=$( echo $1 | cut -d"/" -f2 )
num=1
new_ip=$( echo $ip | cut -d"." -f1-3 )

while [[ $num -ne $no ]]
do
	echo $new_ip".$num"
	(( num = num + 1 ))
done

# 3  
Old 01-09-2007
I'm afraid it's not that easy, anbu23. That works only for class C addresses Smilie
I'll try to write a script and post it, but I'll need some time Smilie
Regards.
# 4  
Old 01-09-2007
Thanks for the fast reply!! But it doesnt works with all CIDR.. for this simple example:

Quote:
./cidr.sh 192.168.0.0/24
192.168.0.1
192.168.0.2
192.168.0.3
192.168.0.4
192.168.0.5
192.168.0.6
192.168.0.7
192.168.0.8
192.168.0.9
192.168.0.10
192.168.0.11
192.168.0.12
192.168.0.13
192.168.0.14
192.168.0.15
192.168.0.16
192.168.0.17
192.168.0.18
192.168.0.19
192.168.0.20
192.168.0.21
192.168.0.22
192.168.0.23
Complete list according to this network must be:

Quote:
192.168.0.1
192.168.0.2
192.168.0.3
192.168.0.4
192.168.0.5
(..)
192.168.0.250
192.168.0.251
192.168.0.242
192.168.0.253
192.168.0.254
I have found this module for Perl, but I prefer a shell script:

http://search.cpan.org/~mrsam/Net-CIDR-0.11/CIDR.pm

Regards,
# 5  
Old 01-09-2007
checkout this script

ip=$( echo $1 | cut -d"/" -f1 )
no=$( echo $1 | cut -d"/" -f2 )
k=`expr 32 - $no`
nu=$(echo "2 ^ $k" | bc)
num=1
new_ip=$( echo $ip | cut -d"." -f1-3 )
while [[ $num -ne $nu ]]
do
echo $new_ip".$num"
(( num = num + 1 ))
done
Last edited by Krrishv; 01-09-2007 at 09:29 AM..
# 6  
Old 01-09-2007
Krrishv , this scripts works fine for CIDR from /24 to /32, but for bigger networks it doenst work, example:

Quote:
$
./cidr.sh 192.168.0.0/19
(..)
192.168.0.8184
192.168.0.8185
192.168.0.8186
192.168.0.8187
192.168.0.8188
192.168.0.8189
192.168.0.8190
192.168.0.8191
Thanks anyway, regards :-)
# 7  
Old 01-09-2007
yeah i will get u that script soon.
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