🌐
DNS Propagation Explained for New Users
What propagation really means, how DNS caching works at every layer, and how to debug delays without panic.
Read PostBlog
Real Issues, Real DNS Lessons
Production incidents, operational deep-dives, security advisories, and community management — written by the team running is-cool-me.
Featured Posts
Hand-picked reads covering the most common DNS and operations challenges.
🛡️
Preventing Subdomain Takeovers After Deploy Deletions
Why dangling DNS records are risky, real-world takeover scenarios, and how to clean them safely.
Read Post🚫
How Automatic Provisioning and Abuse Flags Work
Subdomains are issued automatically, and high-risk abuse patterns can be flagged automatically — here is how the system works.
Read PostAll Posts
Browse every post by category or search.
🌐
DNS Propagation Explained for New Users
What propagation really means, how DNS caching works at every layer, and how to debug delays without panic.
Read Post✉️
Email on Subdomains: MX, SPF, and DKIM Basics
A practical intro to reliable email delivery on your subdomain, covering MX records, SPF policies, and DKIM signing.
Read Post🔄
Fixing CNAME Loop Errors on Static Hosts
How CNAME loops happen on Vercel, Netlify, and similar platforms, and how to break them without downtime.
Read Post📋
Using TXT Records for Domain Verification
A no-nonsense guide to verification records for SaaS platforms and how to debug verification failures.
Read Post⚡
Cloudflare Proxy vs DNS-only for Subdomains
When to use each mode and what breaks if you pick the wrong one for your use case.
Read Post🛡️
Preventing Subdomain Takeovers After Deploy Deletions
Why dangling DNS records are risky and how to clean them safely.
Read Post📜
How We Think About Fair Use for Free Subdomains
Usage patterns that help keep a free DNS service healthy for everyone.
Read Post⚠️
How to Handle Abuse Reports Responsibly
A response workflow for phishing, impersonation, and spam reports.
Read Post🚫
How Automatic Provisioning and Abuse Flags Work
Subdomains are issued automatically, and high-risk abuse patterns can be flagged automatically.
Read Post📊
Post-Incident Review Template for DNS Outages
How to write useful incident reviews after DNS or config failures.
Read PostNo posts found matching your criteria.