Darknet - Hacking Tools, Hacker News & Cyber Security Follow HardCIDR – Network CIDR and Range Discovery Tool HardCIDR is a Linux Bash script to discover the netblocks, or ranges, (in CIDR notation) owned by the target organization during the intelligence gathering phase of a penetration test. https://www.darknet.org.uk/2022/12/hardcidr-network-cidr-and-range-discovery-tool/ darknet.org.uk