# grepcidr

> Filter IP addresses matching IPv4 CIDR/network specification

**Wikidata**: [Q110474656](https://www.wikidata.org/wiki/Q110474656)  
**Source**: https://4ort.xyz/entity/grepcidr

## Summary
grepcidr is a software utility that filters IP addresses matching IPv4 CIDR/network specifications. It is a command-line tool designed for processing and selecting IP addresses based on network ranges, primarily used in system administration and networking tasks.

## Key Facts
- grepcidr is a software utility that filters IP addresses matching IPv4 CIDR/network specifications
- It is available as a Debian stable package named "grepcidr"
- The Gentoo package for grepcidr is named "sys-apps/grepcidr"
- It is available through Homebrew with the formula name "grepcidr"
- grepcidr is listed on OSDN/Freshmeat as "freshmeat_grepcidr"
- It has a descriptive page at "http://freshmeat.sourceforge.net/projects/grepcidr"
- grepcidr is classified as both software and a computer program

## FAQs
### Q: What is the primary function of grepcidr?
A: grepcidr is a command-line utility designed to filter IP addresses based on IPv4 CIDR/network specifications. It processes input data and outputs only IP addresses that match specified network ranges.

### Q: How can I install grepcidr on my system?
A: grepcidr is available through multiple package managers. You can install it on Debian systems with the "grepcidr" package, on Gentoo systems with "sys-apps/grepcidr", and on macOS with Homebrew using the formula name "grepcidr".

### Q: What network protocols does grepcidr support?
A: According to its description, grepcidr specifically supports IPv4 CIDR/network specifications, filtering IP addresses that match these network ranges.

### Q: Where can I find more information about grepcidr?
A: grepcidr is documented on Freshmeat at "http://freshmeat.sourceforge.net/projects/grepcidr", which provides additional details about the project.

### Q: What category of software does grepcidr belong to?
A: grepcidr is classified as both a software utility and a computer program, falling under the category of networking tools and system administration software.

## Why It Matters
grepcidr plays an important role in network administration and system management by providing a simple, efficient way to filter IP addresses based on network specifications. In environments where large volumes of IP data need processing, such as log analysis, security monitoring, or network configuration management, grepcidr offers a specialized solution that simplifies the identification of IP addresses within specific network ranges. Its availability across multiple Linux distributions and macOS makes it a versatile tool for system administrators and network engineers who need to work with IP address filtering in various operating environments.

## Notable For
- Specialized functionality for filtering IP addresses based on CIDR/network specifications, which is a critical need in network administration
- Wide availability across major Linux distributions (Debian, Gentoo) and macOS (Homebrew), making it accessible in diverse computing environments
- Direct integration with standard Unix/Linux command-line workflows, allowing it to be easily combined with other text processing tools

## Body
### Functionality
grepcidr is a command-line utility designed for filtering IP addresses based on IPv4 CIDR/network specifications. It processes input data and outputs only IP addresses that match specified network ranges.

### Package Availability
- Debian stable package: grepcidr
- Gentoo package: sys-apps/grepcidr
- Homebrew formula name: grepcidr

### Project References
- OSDN/Freshmeat project: freshmeat_grepcidr
- Descriptive URL: http://freshmeat.sourceforge.net/projects/grepcidr

### Classification
- Instance of: software
- Instance of: computer program

The tool is particularly valuable for system administrators and network engineers who need to process large volumes of IP addresses to identify those within specific network ranges, commonly used in log analysis, security monitoring, and network configuration tasks.