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The textproc/grepcidr3 port

grepcidr3-3.0 – filter files for IP address matches (cvsweb github mirror)

Description

grepcidr3 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. grepcidr3 is capable
of comparing thousands or even millions of IPs to networks with little
memory usage and in reasonable computation time.

grepcidr3 has endless uses in network software, including: mail filtering
and processing, network security, log analysis, and many custom applications.
WWW: https://github.com/jrlevine/grepcidr3

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The OpenBSD ports mailing-list

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net textproc

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