grepcidr

grepcidr is a 

grepcidr can be used to filter a list of IP addresses against one or more Classless Inter-Domain Routing (CIDR) specifications. As with grep, there are options to invert matching and load patterns from a file. grepcidr is capable of efficiently processing large numbers of IPs and networks.

grepcidr has endless uses in network software, including: mail filtering and processing, network security, log analysis, and many custom applications.

For detailed instructions and examples, please see the README file or man page. A couple examples of usage:

	grepcidr 2001:db8::/32 logfile
	grepcidr 66.249.64.0/19 access.log

Reference: http://www.pc-tools.net/unix/grepcidr/

Install grepcidr with your package manager:

 sudo apt install grepcidr 

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