Provided by: grepcidr_1.3-6_amd64
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 127.0.0.0/8 iplog Searches for any localnet IP addresses inside the iplog file grepcidr "192.168.0.1-192.168.10.13" 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 firstname.lastname@example.org 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 /usr/share/common-licenses/GPL. GREPCIDR(1)