Local preview. Network cards use sample data; device cards show live information.
ASTROTOR BLOG
QR Code, IP and Digital Security Guides
Practical guides to IP addresses, network protocols and digital privacy.
Back to home4 practical guidesOpen to everyone · Free to read
URL · vCard · Wi-Fi
QR CODE GUIDE
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.
IPv4 / IPv6
IP & NETWORK
What does your IP address reveal?
Understand public and private IP addresses, approximate location and VPNs.
A · AAAA · MX · TXT
PRACTICAL GUIDE
Reading DNS records: from A to TXT.
A practical introduction to DNS records for website and email troubleshooting.
HTTPS / TLS 1.3
PRIVACY & SECURITY
Beyond the padlock: HTTPS and TLS.
What does encryption protect? A guide to TLS, HSTS and certificates.
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