Hi, I'm Emrah Ustundag.
I build secure software.
Software Engineering student at Atılım University with a focus on cybersecurity, backend development, and secure software practices. Based in Ankara, Turkey.
Library Management System
Web-based system with Django. Authentication, CRUD operations, normalized relational database.
Car Rental Management System
Oracle-based relational database schema with full CRUD, constraints, and HTML/CSS/JS frontend.
HTTP Security Header Checker
Analyzes HTTP security headers of any website and returns a security score with detailed breakdown.
StockFlow
Full-stack inventory management platform with sales, purchases, customers, suppliers, and audit logging.
HTTP Security Header Checker
Enter any URL and get an instant security header analysis with scoring.
SSL/TLS Certificate Checker
Check SSL certificate validity, expiry date, and cipher strength for any domain.
Subdomain Enumerator
Discover active subdomains of any domain via DNS resolution.
WHOIS & DNS Lookup
Retrieve registration details, expiry dates, and DNS records for any domain.
Password Strength Checker
Analyze password strength locally — score, crack time estimate, and improvement tips.
Hash Generator & Identifier
Generate MD5, SHA-1/256/512 hashes or identify an unknown hash type instantly.
IP Reputation Checker
Check if an IP has been reported for malicious activity. Location, ISP, abuse score.