QR Code, IP and Digital Security Guides
Practical guides to IP addresses, network protocols and digital privacy.
Back to homePublic vs Private IP Addresses: Differences and How to Find Yours
Understand public and private IPs, IPv4 and IPv6, routers and VPNs. Learn which address websites see and what it can reveal.
How to Create a Wi-Fi QR Code: A Practical Sharing Guide
Create a Wi-Fi QR code using your network name and password. Learn about guest networks, printing, scanning and password changes.
What Is Browser Fingerprinting? What Websites Can See
Learn how browser version, screen and device signals combine, how fingerprinting differs from cookies and what private browsing can change.
How to Create a QR Code: A Step-by-Step Guide
Learn to create static QR codes for URLs, contacts, Wi-Fi, phone and email. Customize colors and logos, export and test before printing.
What does your IP address reveal?
Understand public and private IP addresses, approximate location and VPNs.
Reading DNS records: from A to TXT.
A practical introduction to DNS records for website and email troubleshooting.
Beyond the padlock: HTTPS and TLS.
What does encryption protect? A guide to TLS, HSTS and certificates.