Provided by: grepcidr_1.3-6_amd64 bug


       grepcidr — Filter IP addresses matching IPv4 CIDR/network specification


       grepcidr [-V]  [-c]  [-v]  [-e pattern | -f file]


       This manual page documents briefly the grepcidr command.

       This manual page was written for the Debian distribution because the original program does
       not have a manual page.

       grepcidr can be used to filter a list of IP addresses against one or more Classless Inter-
       Domain Routing (CIDR) specifications, or arbitrary networks specified by an address range.
       As with grep, there are options  to  invert  matching  and  load  patterns  from  a  file.
       grepcidr is capable of comparing thousands or even millions of IPs to networks with little
       memory usage and in reasonable computation time.


       -V        Show software version

       -c        Display count of the matching lines, instead of showing the lines

       -v        Invert the sense of matching, to select non-matching IP addresses

       -e        Specify pattern(s) on command-line

       -f        Obtain CIDR and range pattern(s) from file


       grepcidr -f ournetworks blocklist > abuse.log

       Find our customers that show up in blocklists

       grepcidr iplog

       Searches for any localnet IP addresses inside the iplog file

       grepcidr "" iplog

       Searches for IPs matching indicated range in the iplog file

       script | grepcidr -vf whitelist > blacklist

       Create a blacklist, with whitelisted networks removed (inverse)

       grepcidr -f list1 list2

       Cross-reference two lists, outputs IPs common to both lists


       This manual page was written by Ryan Finnie for the Debian system (but may
       be used by others).  Permission is granted to copy, distribute and/or modify this document
       under the terms of the GNU General Public License, Version 2 any later  version  published
       by the Free Software Foundation.

       On  Debian  systems,  the  complete text of the GNU General Public License can be found in