cidrmerge ☆

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Description:
CIDR merging with network exclusion

Type: Formula | Latest Version: 1.5.3@0 | Tracked Since: Dec 17, 2025

Links: Homepage | formulae.brew.sh

Category: Networking

Tags: networking cidr ip-address cli sysadmin

Install: brew install cidrmerge

About:
cidrmerge is a command-line utility designed to merge and manipulate CIDR (Classless Inter-Domain Routing) IP address blocks. It intelligently combines adjacent or overlapping network ranges into a minimal set of CIDR notations while also supporting the exclusion of specific subnets from larger blocks. This tool is essential for network administrators needing to optimize routing tables, simplify firewall rules, and manage IP address allocations efficiently.

Key Features:

Efficiently merges adjacent and overlapping CIDR blocks
Supports network exclusion to subtract subnets from larger ranges
Parses and outputs standard CIDR notation for easy integration
Lightweight command-line interface for scripting and automation

Use Cases:

Optimizing firewall rule sets by reducing the number of CIDR entries
Calculating aggregated network ranges for routing table configuration
Cleaning up IP address lists by merging contiguous blocks
Generating IP blacklists with specific exclusions

Alternatives:

netaddr – A Python library offering similar functionality but requires a Python runtime rather than a standalone binary.
ipcalc – A broader network calculation tool that includes CIDR merging features alongside subnetting and broadcast calculations.

License: GPL-2.0-or-later

Bottles available for: arm64_tahoe, arm64_sequoia, arm64_sonoma, arm64_ventura, arm64_monterey, arm64_big_sur, sonoma, ventura, monterey, big_sur, catalina, arm64_linux, x86_64_linux

Version History

Detected	Version	Rev	Change	Commit
Sep 12, 2025 8:37pm		0	VERSION_BUMP	b0fbf160