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Curated developer articles, tutorials, and guides — auto-updated hourly
Ece KaptanAug 23, 2026 • 10 min read
Understanding DNS by building dig
Everyone says DNS is like a phone book for the internet, but most people never stop to ask how it...
#c#dns#networking#programming
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Roman4d ago • 3 min read
Understanding `dig`: How to Actually Read DNS Query Output
If you've ever stared at the output of dig example.com and only understood half of it, you're not...
#dns#linux#networking#devops
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GuatuAug 22, 2026 • 8 min read
Pushgateway Heartbeat Gotcha: When ndots and NetworkPolicy Silently Eat Your Alerts
How ndots:5, a wildcard DNS record, and a default-deny NetworkPolicy combine to swallow CronJob hear...
#prometheus#pushgateway#dns#networkpolicies
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Pierre BengevengaAug 21, 2026 • 5 min read
SPF record hygiene: the security debt nobody logs
Nobody opens a ticket for an SPF record. There is no alert, no dashboard turning red, no user callin...
#security#dns#sysadmin
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Petr Michal6d ago • 4 min read
The SPF redirect trap: why -all can make redirect= useless
A subtle SPF configuration mistake can cause redirect= to never run. Here is how SPF evaluates redir...
#email#dns#security#devops
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Connor DAug 24, 2026 • 2 min read
I let a domain expire once. Now I check them all with a script.
A few years back I let a domain lapse. Not a throwaway one either. It was live, had traffic, and I.....
#bash#domains#dns#webdev
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MerlonixAug 24, 2026 • 6 min read
Domain Expiry vs SSL Expiry: Two Clocks, Two Very Different Outages
An expired SSL certificate and an expired domain registration are two independent clocks that fail i...
#ssl#dns#webdev#devops
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TechPulse 6d ago • 3 min read
ISC BIND 9.18.42 Released: Major Milestone for DNS Security
ISC BIND 9.18.42 Released: Major Milestone for DNS Security Meta: ISC’s BIND 9.18.42 hit...
#opensource#bind#dns#isc
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Merlonix6d ago • 4 min read
GitHub Pages Silently Fails to Provision SSL — and the “Enforce HTTPS” Checkbox Stays Checked Anyway
GitHub Pages auto-provisions Let's Encrypt SSL for custom domains and fails silently when DNS is wro...
#github#ssl#dns#devops
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Merlonix6d ago • 6 min read
A Dangling CNAME Is a Subdomain Takeover Waiting to Happen — and DNS Still Resolves Fine
A CNAME left pointing at a deleted service resolves fine and stays green in every uptime check — whi...
#dns#security#devops#webdev
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Merlonix6d ago • 6 min read
DNSSEC Fails Closed: A Broken Signature Is a SERVFAIL, Not a Warning
Most security controls fail open. DNSSEC is the opposite: a broken signature returns SERVFAIL from e...
#dns#security#devops#webdev
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Merlonix6d ago • 6 min read
A CAA Record Decides Who Can Issue Your Certificates. Almost Nobody Watches It.
How CAA records and RFC 8659 inheritance decide which CA may issue your certs — and why a subdomain’...
#dns#security#devops#webdev
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Taylor WangAug 22, 2026 • 5 min read
The Model API Wasn't Down. My Free Server's DNS Resolver Was.
Last week my summarization worker started failing in a way that looked like a provider outage. The.....
#debugging#node#dns#webdev
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speed engineer4d ago • 3 min read
We Failed Over to a Healthy Region. The JVM Never Noticed — It Had Cached the DNS Answer Forever.
The problem 3:40 AM. One region's load balancers started throwing 5xx at roughly 8% of...
#java#dns#networking#reliability
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Ashish NairAug 24, 2026 • 2 min read
I Built Hybrid DNS Between AWS and My On-Prem Linux Server -- Here's What Finally Made Route 53 Resolver Click
Why I built this? I wanted to actually build a hybrid DNS environment and see the DNS...
#aws#dns#devops
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Merlonix6d ago • 4 min read
DNS record drift: what causes it, why uptime checks miss it, and how to detect it
What actually causes DNS records to change out from under you, why an HTTP uptime check is structura...
#dns#devops#security#webdev
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Rijul RajeshAug 21, 2026 • 3 min read
What Is mDNS? Access Devices on Your Local Network by Name
Hello, I'm Rijul. I'm building git-lrc, a micro AI code reviewer that runs on every commit. It's fre...
#dns#network
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Joseph Diaz5d ago • 2 min read
What an SPF and DMARC presence check can—and cannot—tell you
This article was written with assistance from an AI writing program and reviewed against the behavio...
#security#dns#tutorial#showdev
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VeloCMS5d ago • 4 min read
How to Connect a Custom Domain to Your Blog (From Any Registrar)
Connect a domain you already own to your VeloCMS blog in one screen: type the domain, add the DNS re...
#customdomain#dns#gettingstarted#seo
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Bug CircuitAug 24, 2026 • 6 min read
Is Wix or Squarespace Secure? What They Do & Don't Cover
Wix and Squarespace lock down servers and SSL for you, but weak passwords, bad embeds, and missing D...
#wixsecurity#squarespacesecurity#websitebuilders#dns
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Håkan FägnellAug 23, 2026 • 8 min read
SPF Record Syntax: Mechanisms & Limits | FortifyNet
An SPF record is one DNS TXT record that starts with v=spf1, lists your authorized senders and ends ...
#spf#spfrecord#emailauthentication#dns
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Umesh MalikAug 22, 2026 • 6 min read
Vercel CLI DNS Commands: Manage Records Without the Dashboard
Use Vercel CLI DNS commands to manage records, renew domains, and pause projects from terminal. Auto...
#vercel#cli#dns#developertooling
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MonsterMegs5d ago • 6 min read
How to Set Up Business Email Hosting on Your Own Domain
Originally published at https://monstermegs.com/blog/business-email-hosting/ Would you buy from a....
#cpanel#dns#email#emailhosting
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Rasika DangamuwaAug 25, 2026 • 3 min read
How to Create a BIMI Record (Free Generator + Real Setup Example)
How to Create a BIMI Record (Free Generator + Real Setup Example) If you've ever wondered...
#email#dns#security#webdev
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