A grep-like tool for searching input with CIDR-style IPv4/IPv6 patterns
A tool somewhat like http://www.pc-tools.net/unix/grepcidr/ only written from scratch in Python and provided under a BSD license.
Usage: grepcidr.py [options] [filename | - ..]
Options:
--version show program's version number and exit
-h, --help show this help message and exit
-v Show lines that do NOT match
-x, --strict Only match whole lines
-o, --only Show the matching IPs
-c, --count Show the count of matches instead of actual matches
-q, --quick Quit after the first match
--with-filename Print filename for each match (the default when there
is more than one file to search)
--no-filename Suppress filenames in output
-f FILENAME, --file=FILENAME
Read patterns from FILENAME
-e PATTERNS Specify one or more patterns on the command-line
Output all lines in file.txt with an IP address matching 192.168.0.0/24
$ grepcidr.py 192.168.0.0/24 file.txt
Output all lines in file.txt with an IP address matching FD::/64
$ grepcidr.py FD::/64 file.txt
Output all lines in file.txt that do not match the network 192.168.0.0/24
$ grepcidr.py -v 192.168.0.0/24 file.txt
Quickly test if file.txt contains any matches on the network
192.168.0.0/24
$ grepcidr.py -q 192.168.0.0/24 file.txt && echo yep || echo nope
Count the number of matches on the network 192.168.0.0/24 in file.txt
$ grepcidr.py -c 192.168.0.0/24 file.txt
Assuming log.txt has a number of fields per row but you only want the
IP addresses without all the other information
$ grepcidr.py -o 192.168.0.0/24 log.txt
Print 192.168.0.0/16 addresses associated with the current machine
$ ifconfig -a | grepcidr.py -o 192.168.0.0/24
Who was logged in access*.log from some place other than
192.168.0.0/16, don't care which file it was
$ grepcidr.py -v --no-filename 192.168.0.0/24 access*.log
Who is in web.log from some place other than RFC-1918 addresses?
$ grepcidr.py -v -e 192.168.0.0/16 -e 10.0.0.0/8 -e 172.16.0.0/12 web.log