grepcidr 1.3

grepcidr can filter IP addresses matching IPv4 CIDR/network specification. 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. grepcidr has endless uses in network software, including: mail filtering and processing, network security, log analysis, and many custom applications. COMMAND USAGE grepcidr [-V] [-c] [-v] PATTERN [FILE] grepcidr [-V] [-c] [-v] [-e PATTERN | -f FILE] [FILE] -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 PATTERN specified on the command line may contain multiple patterns separated by whitespace or commas. For long lists of network patterns, specify a -f FILE to load where each line contains one pattern. Comment lines starting with # are ignored, as are any lines that dont parse. Each pattern, whether on the command line or inside a file, may be: CIDR format a.b.c.d/xx IP range a.b.c.d-e.f.g.h Single IP a.b.c.d EXAMPLES 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 Whats New in This Release: - Much faster than past versions due to binary search of patterns - Decreased memory usage - Applied search improvements suggested by Dick Wesseling - Now supports IP ranges as well as CIDR format - Improved usage to be more grep-like (e.g. filename on command line) - Now uses grep-like exit code (0=ok, 1=no match, 2=error).

Requirements:	No special requirements
Platforms:	Linux
Keyword:	-f,  Addresses,  Cidr,  File,  Filter,  Grepcidr,  Ip Addresses,  Ips,  Matching,  Networking,  Pattern,  Range,  System
Users rating:	0/10