macOS
Homebrewverified · 100%
brew install grepcidrlocal Homebrew formula metadata
MacPortsverified · 94%
sudo port install grepcidrMacPorts ports tree · sysutils/grepcidr/Portfile · source: api.github.com
brew
Install grepcidr with Homebrew, apt, dnf, MacPorts, Nix, zypper
Filter IP addresses matching IPv4 CIDR/network specification. Version 2.0 via Homebrew; verified from local package data.
install
Additional install commands
Linux
Debian aptverified · 92%
sudo apt install grepcidrDebian stable package indexes · grepcidr · source: deb.debian.org
Fedora dnfverified · 92%
sudo dnf install grepcidrFedora Rawhide package metadata · grepcidr · source: dl.fedoraproject.org
Nixverified · 92%
nix profile install nixpkgs#grepcidrnixpkgs package indexes · pkgs/by-name/gr/grepcidr/package.nix · source: api.github.com
openSUSE zypperverified · 92%
sudo zypper install grepcidropenSUSE Tumbleweed package metadata · grepcidr · source: download.opensuse.org
overview
Package summary
Filter IP addresses matching IPv4 CIDR/network specification
Project links
Commands and aliases
- grepcidr
history
Project history and usage
grepcidr is a small C command-line filter for matching IPv4 and IPv6 addresses against CIDR patterns. It borrows grep's interface style for a networking-specific job: select or reject log lines by address range.
Project history
Jem Berkes identifies the pc-tools.net grepcidr as the original project, created in 2004 and released as grepcidr 2.0 on 2014-05-26. The official page emphasizes that the 2.0 line is distinct from John Levine's separately developed fork, even though both names can confuse users.
Version 2.0 added IPv6 support, replaced a regex-based scanner with a hints scanner reported as faster on some platforms, enforced stricter IP text matching, added multiple file arguments, supported unlimited input line length, and improved CIDR validation.
Adoption history
grepcidr's niche is operational networking: mail filtering, network security, log analysis, and custom pipelines where a full IP-address database or firewall tool would be too heavy. Its adoption in package managers follows from being a single-purpose Unix filter with no documented configuration or credential state.
How it is used
The official examples show grepcidr matching an IPv6 documentation prefix against a log file and matching a Googlebot-era IPv4 CIDR range against access.log. Options include count output, inverted matching, strict CIDR alignment, strict start-of-line matching, command-line patterns, and pattern files.
Why package nerds care
grepcidr is package-nerd significant because it is a tiny specialist filter that fills a gap between grep and heavier network-analysis tools. It lets shell users keep grep-like pipelines while making CIDR math correct enough for log and abuse workflows.
The official fork note matters for packaging: downstreams need to know whether they are shipping Berkes' grepcidr 2.0 line or Levine's unrelated implementation.
Timeline
- 2004: Original grepcidr project created, according to the official project page.
- 2014: grepcidr 2.0 released with IPv6 support, faster scanning, stricter matching, and multiple-file support.
- 2014: Official page documented the distinction between Berkes' project and the separately developed grepcidr-2 fork.
Related projects
- grep is the interface model for matching and inverted matching.
- John Levine's grepcidr-2 fork is called out by the official page as an unrelated implementation.
- Spamhaus is credited on the official page for sponsorship and testing of features.
Sources
security posture
Risk level: blue
broad file, network, media, or database tool signal.
Risk classifier
blue risk · medium confidence · tool
Why
- broad file, network, media, or database tool signal
Signals
- text:network
Install behavior
- No Homebrew post-install hook is recorded in formula metadata.
- Homebrew bottle metadata is available for 13 platform targets.
Recommended review
Before unattended agent use, check whether the tool reads plaintext credentials, writes remote state, publishes artifacts, or shells out to plugins.
executables
Installed executables
| Command | Kind | Exposure | Note |
|---|---|---|---|
grepcidr | cli | global executable |
freshness
Version and freshness
These signals separate page generation age, package-manager activity, and upstream release comparison. Version lag is warned only when an evidence URL and comparable versions are present.
page generated2026-07-08
manager version2.0
manager updated
local dataok
upstreamnot checked
latest detectednot detected
https://www.pc-tools.net/unix/grepcidr/
- infoNo package-manager update timestamp was available.low confidence
- infoRelease/tag comparison is only available for GitHub repositories.https://www.pc-tools.net/unix/grepcidr/none confidence
install metadata
Package metadata
| Package key | brew:grepcidr |
|---|---|
| Version | 2.0 |
| Package manager | Homebrew |
| Package manager page | https://formulae.brew.sh/formula/grepcidr |
| Homepage | https://www.pc-tools.net/unix/grepcidr/ |
| Upstream docs | https://www.pc-tools.net/unix/grepcidr |
| License | GPL-2.0-or-later |
| Source archive | https://www.pc-tools.net/files/unix/grepcidr-2.0.tar.gz |
| Bottle | available (on arm64_big_sur, arm64_linux, arm64_monterey, arm64_sequoia, arm64_sonoma, arm64_tahoe, arm64_ventura, big_sur, catalina, monterey, sonoma, ventura, x86_64_linux) |
| Homebrew post-install | not defined |
| Service | none declared |
registry facts
Source database details
| Source Database | Homebrew formula API |
|---|---|
| Tap | homebrew/core |
| Full Name | grepcidr |
| Version Scheme | 0 |
| Revision | 0 |
| Bottle Stable Root URL | https://ghcr.io/v2/homebrew/core |
| Deprecated | no |
| Disabled | no |
| Keg Only | no |
| URL Keys |
|
source database matches
Other package-manager records
Matches are pulled from external package-manager indexes and kept separate from local Automic Vault package links.
Debian apt95%
grepcidr 2.0-2
Filter IP addresses matching IPv4/IPv6 CIDR/network specification
http://www.pc-tools.net/unix/grepcidr/
sudo apt install grepcidr- Section: net
- Architecture: amd64
- 1 dependencies
- normalized package name match
- Matched by: Grepcidr
Nix95%
grepcidr
nix profile install nixpkgs#grepcidr- normalized package name match
- Matched by: Grepcidr
Ubuntu apt95%
grepcidr 2.0-2
Filter IP addresses matching IPv4/IPv6 CIDR/network specification
http://www.pc-tools.net/unix/grepcidr/
sudo apt install grepcidr- Section: universe/net
- Architecture: amd64
- 1 dependencies
- normalized package name match
- Matched by: Grepcidr
dnf95%
grepcidr 2.0-12.fc44
Filter IPv4 and IPv6 addresses matching CIDR patterns
https://www.pc-tools.net/unix/grepcidr/
sudo dnf install grepcidr- License: GPL-2.0-or-later
- Category: Unspecified
- Architecture: x86_64
- Source Package: grepcidr
- 2 dependencies
- 1 provides
- normalized package name match
- Matched by: Grepcidr
zypper95%
grepcidr 2.0-2.6
Filter IP addresses matching IPv4/IPv6 CIDR specification
http://www.pc-tools.net/unix/grepcidr/
sudo zypper install grepcidr- License: GPL-3.0-or-later
- Category: Productivity/Text/Utilities
- Architecture: x86_64
- Source Package: grepcidr
- 1 dependencies
- 1 provides
- normalized package name match
- Matched by: Grepcidr
MacPorts95%
grepcidr
sudo port install grepcidr- normalized package name match
- Matched by: Grepcidr
source trail
Generated from repository data
This page is generated by av-web from the private package SQLite artifact built by scripts/generate-pkg-sqlite.py.
Combined YAML source
View the package source record on GitHub.
Used sources
- Geiger risk classifier
- Nucleus package database
- av.db category and tag curation
- cross-ecosystem install command graph
- curated package history
- external package-manager database matches
- package relationship graph
- package version freshness
- package-page enrichment