Extensions for crt.sh
16 browser extensions built for crt.sh. Compare features, permissions, and safety across Chrome, Firefox, and Edge.
Open in the full catalog with filters →
Chrome Web StoreSubdomain Finder - Find Hidden Subdomains
The best Subdomain Finder tool for bug bounty hunters and security researchers. Find hidden subdomains quickly and easily.
Chrome Web StoreVAPT Assistant Pro+
Advanced VAPT toolkit with AI, security headers, WAF detection, DNS/WHOIS tools, subdomain scanner, and VirusTotal integration.
Chrome Web StoreRealMonitor — Website Uptime & WordPress Manager
All-in-one website monitoring: uptime tracking, domain management, WordPress oversight, Telegram & Email alerts.
NetProbe - My IP Checker & Domain Toolkit
NetProbe: All-in-one IP address checker, domain toolkit and speed test checker. Real-time IP, location, ISP info. WebRTC and VPN leak test, ping latency, port checker, SSL validation and DNS records tools. copy or Export data as JSON files.
—3.0
Chrome Web StoreDNS Forensic Auditor
DNS auditing with DNSSEC validation, WHOIS/RDAP, SSL certificates, email security, GeoIP, and A-F grading.
Chrome Web StoreOrigin IP Lookup
Find the real server IP behind Cloudflare, Fastly and other CDNs. DNS lookup, cert transparency, subdomain probing, IP intelligence.
Chrome Web StoreDomain WHOIS Lookup
WHOIS lookup, DNS records, SSL certificate info, domain registration details. Free, instant, no account needed.
Chrome Web StoreSEOSnap Pro — By Dev Muhammad
Professional SEO toolkit for bloggers. Domain Age, WHOIS, SSL, Backlinks & Traffic insights — all in one click.
Chrome Web StoreWeb Audit Tool
Analyze SEO, performance, security, DNS, email, SSL, domain, blacklist. Analysis runs locally — no data sent out.
Chrome Web StoreFakeshop-Checker
Erkennt gefälschte Online-Shops mit KI, Heuristiken und Live-Prüfung – kostenlos, von online-sicher.de.
Chrome Web StoreDomain Intel by IFFO TECH
Domain Intel by IFFO TECH is a minimalist and powerful extension for developers, OSINT researchers, and security enthusiasts. Key…
Chrome Web StoreDomain Age Checker
Inspect the current site's domain age, registration, DNS, DNSSEC, SSL certificate, and common subdomains.
Chrome Web StoreDomainIntel – WHOIS, DNS & Domain Checker
WHOIS, DNS, SSL, email-security (SPF/DKIM/DMARC), subdomain discovery, tech stack & domain health — all in one popup.
Firefox Add-onscrtSubX
No description
Chrome Web StoreRiskSentinel
RiskSentinel – real-time scam and risk detection for websites.