Learn with ShowDNS

Explore foundational knowledge for DNS, SSL, and security.

Clear explanations, practical tips, and deep dives to help you stay ahead of critical infrastructure changes.
4 articles
12,200 total views
3 categories
Need step-by-step help?

Jump into our guided playbooks for troubleshooting and configuration checklists.

Validate HSTS and SSL posture

Optimize DNS and resolver choices

Strengthen email authentication

Featured learning

Start with our most-read primers and configuration walkthroughs.

Security

HSTS Header Guide

Understand Strict-Transport-Security directives and configure HSTS safely for your domains.

HSTS
HTTPS
Headers
Dec 15, 20246 min read2,680 views
Security

What is HSTS Preload?

Learn how the HSTS preload list works and when to submit your domain.

HSTS
Security
HTTPS
Dec 14, 20245 min read2,140 views

Browse all articles

Filter by category or sort by popularity to find what you need.

All
Security
DNS
Email Security
Security

HSTS Header Guide

Understand Strict-Transport-Security directives and configure HSTS safely for your domains.

HSTS
HTTPS
Headers
Dec 15, 20246 min read2,680 views
Security

What is HSTS Preload?

Learn how the HSTS preload list works and when to submit your domain.

HSTS
Security
HTTPS
Dec 14, 20245 min read2,140 views
DNS

10 Best DNS Providers

Compare the fastest DNS providers and choose the right resolver for performance and privacy.

DNS
Providers
Performance
Dec 5, 202412 min read4,230 views
Email Security

SPF, DKIM, and DMARC Role

See how SPF, DKIM, and DMARC work together to prevent spoofing and improve deliverability.

SPF
DKIM
DMARC
Nov 28, 202410 min read3,150 views