# 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 ```sh sudo av install brew:grepcidr ``` Additional install commands: ### macOS - Homebrew (100%): ```sh brew install grepcidr ``` Evidence: local Homebrew formula metadata - MacPorts (94%): ```sh sudo port install grepcidr ``` Evidence: MacPorts ports tree: sysutils/grepcidr/Portfile from https://api.github.com/repos/macports/macports-ports/git/trees/master?recursive=1 ### Linux - Debian apt (92%): ```sh sudo apt install grepcidr ``` Evidence: Debian stable package indexes: grepcidr from https://deb.debian.org/debian/dists/stable/main/binary-amd64/Packages.xz - dnf (92%): ```sh sudo dnf install grepcidr ``` Evidence: Fedora Rawhide package metadata: grepcidr from https://dl.fedoraproject.org/pub/fedora/linux/development/rawhide/Everything/x86_64/os/repodata/e5ca8ce900cd68f5419e1c39ae517343100b306336cbaeb70a3c153121d95094-primary.xml.zst - Nix (92%): ```sh nix profile install nixpkgs#grepcidr ``` Evidence: nixpkgs package indexes: pkgs/by-name/gr/grepcidr/package.nix from https://api.github.com/repos/NixOS/nixpkgs/git/trees/master?recursive=1 - zypper (92%): ```sh sudo zypper install grepcidr ``` Evidence: openSUSE Tumbleweed package metadata: grepcidr from https://download.opensuse.org/tumbleweed/repo/oss/repodata/be8d3611d25469107f32075a1697e69ec57a2b850b42348a658cc671ad5ec2b50760d02c3e59524d50da9a11d5be799bdaffba2e166e8ca8858512e3c0bd665d-primary.xml.zst ## Package facts - **Package key:** brew:grepcidr - **Package manager:** Homebrew - **Package manager page:** - **Version:** 2.0 - **Source summary:** Filter IP addresses matching IPv4 CIDR/network specification - **Homepage:** - **Upstream docs:** - **License:** GPL-2.0-or-later - **Source archive:** - **Generated:** 2026-07-08T07:18:31+00:00 ## Executables - grepcidr (cli) - grepcidr (alias) ## Install behavior - Post-install hook: not defined - Bottle: available on arm64_big_sur, arm64_linux, arm64_monterey, arm64_sequoia, arm64_sonoma, arm64_tahoe, arm64_ventura, big_sur, catalina, monterey, sonoma, ventura ## Freshness - Page generated: 2026-07-08 - Package-manager version: 2.0 - Local data: ok - Upstream repository: https://www.pc-tools.net/unix/grepcidr/ - info: No package-manager update timestamp was available. - info: Release/tag comparison is only available for GitHub repositories. ## 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 Notes broad file, network, media, or database tool signal. - **Geiger risk:** blue / medium - broad file, network, media, or database tool signal ## Source Database Details - **Source Database:** Homebrew formula API - **Tap:** homebrew/core - **Full Name:** grepcidr - **Version Scheme:** 0 - **Revision:** 0 - **Bottle Stable Root URL:** - **Deprecated:** no - **Disabled:** no - **Keg Only:** no - **URL Keys:** stable ## Other Package-Manager Records - Debian apt - grepcidr - 2.0-2: normalized package name match | Debian stable package indexes: grepcidr from https://deb.debian.org/debian/dists/stable/main/binary-amd64/Packages.xz | Filter IP addresses matching IPv4/IPv6 CIDR/network specification | http://www.pc-tools.net/unix/grepcidr/ - Nix - grepcidr: normalized package name match | nixpkgs package indexes: pkgs/by-name/gr/grepcidr/package.nix from https://api.github.com/repos/NixOS/nixpkgs/git/trees/master?recursive=1 - Ubuntu apt - grepcidr - 2.0-2: normalized package name match | Ubuntu 24.04 LTS package indexes: grepcidr from https://archive.ubuntu.com/ubuntu/dists/noble/universe/binary-amd64/Packages.gz | Filter IP addresses matching IPv4/IPv6 CIDR/network specification | http://www.pc-tools.net/unix/grepcidr/ - dnf - grepcidr - 2.0-12.fc44: normalized package name match | Fedora Rawhide package metadata: grepcidr from https://dl.fedoraproject.org/pub/fedora/linux/development/rawhide/Everything/x86_64/os/repodata/e5ca8ce900cd68f5419e1c39ae517343100b306336cbaeb70a3c153121d95094-primary.xml.zst | Filter IPv4 and IPv6 addresses matching CIDR patterns | https://www.pc-tools.net/unix/grepcidr/ - zypper - grepcidr - 2.0-2.6: normalized package name match | openSUSE Tumbleweed package metadata: grepcidr from https://download.opensuse.org/tumbleweed/repo/oss/repodata/be8d3611d25469107f32075a1697e69ec57a2b850b42348a658cc671ad5ec2b50760d02c3e59524d50da9a11d5be799bdaffba2e166e8ca8858512e3c0bd665d-primary.xml.zst | Filter IP addresses matching IPv4/IPv6 CIDR specification | http://www.pc-tools.net/unix/grepcidr/ - MacPorts - grepcidr: normalized package name match | MacPorts ports tree: sysutils/grepcidr/Portfile from https://api.github.com/repos/macports/macports-ports/git/trees/master?recursive=1 ## Related links - [Secret-risk packages](https://www.automicvault.com/pkg/secret-risk-packages/) - Has protected-tool coverage, approval-gate, or non-low Geiger security signals. - [Terminal utility packages](https://www.automicvault.com/pkg/terminal-utilities/) - Matched terminal and command-line workflow metadata. - [Networking and protocol packages](https://www.automicvault.com/pkg/networking-protocol-tools/) - Matched network, protocol, or remote-service metadata. - [Homebrew utility packages](https://www.automicvault.com/pkg/brew-utility-packages/) - Matched Homebrew package provider. - [asn](https://www.automicvault.com/pkg/brew/asn/) - Popular package that depends on this formula. - [grepip](https://www.automicvault.com/pkg/brew/grepip/) - Shares av.db curated category or tags: cli, ip-filtering, ip-tools, ipv4, networking. - [cidr](https://www.automicvault.com/pkg/brew/cidr/) - Shares av.db curated category or tags: cidr, cli, networking. - [cidr2range](https://www.automicvault.com/pkg/brew/cidr2range/) - Shares av.db curated category or tags: cidr, cli, networking. - [cidrmerge](https://www.automicvault.com/pkg/brew/cidrmerge/) - Shares av.db curated category or tags: cidr, cli, networking. - [iodine](https://www.automicvault.com/pkg/brew/iodine/) - Shares av.db curated category or tags: cli, ipv4, networking. - [ipcalc](https://www.automicvault.com/pkg/brew/ipcalc/) - Shares av.db curated category or tags: cli, ip-tools, networking. - [mapcidr](https://www.automicvault.com/pkg/brew/mapcidr/) - Shares av.db curated category or tags: cidr, cli, networking. - [netaddr](https://www.automicvault.com/pkg/brew/netaddr/) - Shares av.db curated category or tags: cidr, cli, ipv4, networking. ## Combined YAML source View the package source record on GitHub. [combined/grepcidr.yml](https://github.com/automic-vault/db/blob/main/combined/grepcidr.yml) ## Sources - Nucleus package database - Geiger risk classifier - package-page enrichment - curated package history - package version freshness - av.db category and tag curation - package relationship graph - external package-manager database matches - cross-ecosystem install command graph