cidr-tools

cidr-tools is a developer utility library for parsing, manipulating, and comparing IPv4 and IPv6 CIDR ranges, designed for network engineers and software developers building networking tools. It provides efficient operations like subnetting, merging, and containment checks without external dependencies. Its interesting because it simplifies complex CIDR math into clean, testable functions, making it ideal for infrastructure-as-code, firewall rule generation, or IP address management automation.