Practical security tooling. Pick your stack.
Free, browser-based security tools and no-fluff guides — built by a working engineer, grouped by discipline. No accounts, no paywalls.
Four toolkits for the work you actually do
Governance, Risk & Compliance
Map controls across frameworks, run gap assessments, build your risk register, and triage vendor risk.
IT Operations
Day-to-day infrastructure and network utilities for admins — subnetting, addressing, and segmentation.
Security Operations
Detection engineering and blue-team tooling — event triage and KQL hunting.
OSINT
Open-source intelligence and external attack-surface recon — domains, email, tenants, and takeovers.
Frequently asked questions
What is TheAdminStack?
TheAdminStack is a free collection of browser-based cybersecurity and infrastructure tools, plus practical guides, built and maintained by a working security engineer. Tools are grouped into four areas: Governance Risk & Compliance (GRC), IT Operations, Security Operations (SecOps), and OSINT.
Are the tools really free?
Yes. Every tool on TheAdminStack is free to use with no account, no sign-up, and no paywall. They are built for practitioners who just need to get the job done.
Does my data leave my browser?
The tools are designed to be privacy-first. Most run entirely client-side in your browser, so the data you enter is not stored or sent to a server. Tools that must query an external source (for example DNS or certificate lookups) only send the minimum needed for that lookup.
What tools does TheAdminStack offer?
GRC includes an ISO 27001 reference, a control mapper with gap assessment, a risk register, and a vendor risk assessment. IT Operations includes a CIDR / subnet calculator, a reverse-DNS / PTR lookup, a global DNS propagation checker, and an SPF/DKIM/DMARC email-authentication checker. SecOps includes a Windows Event ID lookup, a KQL query builder, a regex helper, and a JWT/token decoder. OSINT includes SquatWatch, NetRecon, an Email Header Analyzer, TenantRecon, a Subdomain Takeover checker, CertScout, and TechDetect.
Who builds TheAdminStack?
TheAdminStack is built by a cybersecurity engineer and systems administrator with 10+ years securing enterprise environments. The site also offers practical guides and is available for security consulting.