Field guides
Operational security notes.
Concise references for defenders who need useful answers, not filler.
Network Utilities
How to Check If an IP Address Belongs to a CIDR Range
A practical guide for defenders who need to verify whether an IPv4 or IPv6 address belongs to a CIDR network.
Threat Intelligence
MISP Warninglists: Why Defenders Should Use Them Before Blocking IOCs
How warninglists reduce false positives when operationalizing threat intelligence.
Defensive Operations
How to Validate an IOC Before Blocking It on a Firewall
A defender-focused checklist for reducing false positives before automated firewall enforcement.
Cybersecurity lab
Build a practical security lab
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