# Install cidrmerge with Homebrew CIDR merging with network exclusion. Version 1.5.3 via Homebrew; verified from local package data. ## Install ```sh sudo av install brew:cidrmerge ``` Additional install commands: ### macOS - Homebrew (100%): ```sh brew install cidrmerge ``` Evidence: local Homebrew formula metadata ## Package facts - **Package key:** brew:cidrmerge - **Package manager:** Homebrew - **Package manager page:** - **Version:** 1.5.3 - **Source summary:** CIDR merging with network exclusion - **Homepage:** - **Repository:** - **Upstream docs:** - **License:** GPL-2.0-or-later - **Source archive:** - **Generated:** 2026-07-08T18:08:21+00:00 ## Executables - cidrmerge (cli) - cidrmerge (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: 1.5.3 - Local data: ok - Upstream repository: https://cidrmerge.sourceforge.net/ - info: No package-manager update timestamp was available. - info: Release/tag comparison is only available for GitHub repositories. ## Project history and usage CIDRMerge is a C command-line tool and library for merging CIDR networks while applying whitelist-based network exclusion. ### Project history The SourceForge project was created in August 2005 by Daniele Depetrini. The homepage describes a CIDR merge implementation whose output is summarized as small as possible, with an optimization library, a command-line program, and conversion scripts for netmask and CIDR formats. ### Adoption history The homepage says CIDRMerge has been widely used for blacklist merge and optimization and notes use by big ISPs. SourceForge file history shows releases from 1.1.0 in August 2005 through 1.5.3 in July 2008, and Homebrew still packages 1.5.3. ### How it is used Users feed CIDR-formatted lines on standard input, optionally pass a whitelist file, and receive merged or whitelist-filtered CIDR output. The homepage calls out blacklist optimization, RBLDNS workflows, ACL or routing-table reduction, and network-complement computation. ### Why package nerds care CIDRMerge is old-school package-nerd material: a small C utility, CVS-hosted on SourceForge, still useful enough to be bottled by Homebrew years after its last upstream release. It reflects the practical sysadmin lineage of packaging compact network-list tools for spam filtering, firewalling, and route-table maintenance. ### Timeline - 2005: SourceForge project created. - 2005: cidrmerge-1.1.0 released. - 2005: cidrmerge-1.5.0 and 1.5.1 released. - 2008: cidrmerge-1.5.3 released. - 2026: Homebrew formula still packages cidrmerge-1.5.3. ### Related projects - The homepage explicitly mentions RBLDNS and Michael Tokarev's qsort code; related package-manager peers in this batch include cidr and cidr2range. ### 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:** cidrmerge - **Version Scheme:** 0 - **Revision:** 0 - **Bottle Stable Root URL:** - **Deprecated:** no - **Disabled:** no - **Keg Only:** no - **URL Keys:** stable ## 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. - [cidr2range](https://www.automicvault.com/pkg/brew/cidr2range/) - Shares av.db curated category or tags: cidr, cli, ip-addressing, ip-ranges, networking. - [cidr](https://www.automicvault.com/pkg/brew/cidr/) - Shares av.db curated category or tags: cidr, cli, ip-addressing, networking. - [mapcidr](https://www.automicvault.com/pkg/brew/mapcidr/) - Shares av.db curated category or tags: cidr, cli, ip-addressing, networking. - [prips](https://www.automicvault.com/pkg/brew/prips/) - Shares av.db curated category or tags: cidr, cli, ip-addressing, networking. - [ipinfo](https://www.automicvault.com/pkg/brew/ipinfo/) - Shares av.db curated category or tags: cidr, cli, ip-addressing, networking. - [netmask](https://www.automicvault.com/pkg/brew/netmask/) - Shares av.db curated category or tags: cli, ip-addressing, networking. - [range2cidr](https://www.automicvault.com/pkg/brew/range2cidr/) - Shares av.db curated category or tags: cidr, cli, ip-addressing, networking. - [sipcalc](https://www.automicvault.com/pkg/brew/sipcalc/) - Shares av.db curated category or tags: cli, ip-addressing, networking. - [netcat](https://www.automicvault.com/pkg/brew/netcat/) - Local metadata places this package in an adjacent workflow. Shared terms: cli, network, networking. ## Combined YAML source View the package source record on GitHub. [combined/cidrmerge.yml](https://github.com/automic-vault/db/blob/main/combined/cidrmerge.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 - cross-ecosystem install command graph