Wildcard DNS Records: Uses, Risks, and Best Practices
A single DNS record can answer for an unlimited number of subdomains. Add one wildcard entry, and suddenly anything.yourcompany.com , literally-anythi…
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Open Source Project of the Day (#94): MasterDnsVPN —— A Sharpened Blade Against Censorship: The Highly Optimized DNS Tunneling VPN
In extreme network censorship environments, when all conventional VPN protocols (such as WireGuard, VLESS, or Shadowsocks) are accurately identified a…
Move Your WordPress.com Domain to Cloudflare and Halve the Renewal
This post was originally published on Techucation , my blog at malcolmlow.com. Cross-posted here for the dev.to community. My WordPress.com domain ren…
Deploying Pi-hole DNS Sinkhole Service on Ubuntu 24.04
Pi-hole is a network-level ad and tracker blocking application that acts as a DNS sinkhole, returning a null address for known ad and tracking domains…
Deploying AdGuard Home Network Traffic Filtering on Ubuntu 24.04
AdGuard Home is an open-source, network-wide ad and tracker blocking DNS server with a web dashboard, parental controls, and DNS-over-HTTPS/TLS suppor…
Foghorn : a blunt non-DNS solution
What ? Foghorn is a sender/listener pair that periodically sends UDP packets to a destination/subnet , and listens for any other utilities sending suc…
How to Test Your SPF Record for Common Mistakes (Step by Step)
Your SPF record looks correct. You added the include values your email provider told you to add. You saved the record. Emails are still landing in spa…
The Anatomy of a 30-Point Security Audit (And Why Every Domain Needs One)
Most domains have between six and ten security misconfigurations that their owners do not know about. Not because the owners are careless. Because DNS…
ISO 27001 Annex A and Email Security: A Simple Gap Analysis Guide
Your ISMS is certified. Your Statement of Applicability covers the controls. Your auditor arrives and runs a DNS lookup on your domain. dig _dmarc.you…
SOC2 CC6.6 Made Easy: Automating Logical Access Evidence
Your SOC2 audit window opens in three months. Your DMARC policy is p=none . Your auditor is going to flag it. Not because p=none is wrong as a startin…
Why Most DNS Audit Tools Don't Give You the Actual Fix (And Why We Do)
You run the audit. The results come back. SPF: Fail . DMARC: Not configured . Blacklist status: Listed on 3 databases . You stare at the screen. The t…
I built an MCP server for DNS + email security — 37 tools for Claude Code, Cursor, Windsurf
The first time intodns-mcp saved me real time was on day one. Claude scanned a client's domain, listed seven concrete issues with citations to the liv…
Lets Encrypt DNS Challenge with Traefik and AWS Route 53
So, you're self-hosting awesome apps like Jellyfin, Home Assistant, or your personal blog with Docker. You want that sweet, sweet HTTPS padlock for se…
SPF record syntax explained: a practical guide for developers
SPF (Sender Policy Framework) is a DNS record that tells receiving mail servers which servers are allowed to send email on behalf of your domain. If a…
I corrected my AI email security analysis — 6 companies have real gaps
Yesterday I published an analysis claiming that 26 of 39 AI companies use SPF softfail , implying their email could be spoofed. A reader ( @privacyfis…
I Built a Next-Gen DNS Diagnostic CLI in Rust That Visualizes DNSSEC Trust Chains
If you've ever tried to debug a DNSSEC misconfiguration using dig , you know the pain. You're staring at a wall of raw text, manually cross-referencin…
Немного извращений из мира прокси и VPN
XTLS-Reality, XHTTP, Naiveproxy и всякие там AnyTLS - это не интересно. Давайте копнем чуть глубже и посмотрим, где прячется настоящее безумие. Особен…
How to Connect a Namecheap Domain to a DigitalOcean Droplet with Nginx
Buying a domain is exciting. Creating a server is exciting too. But the moment you try to connect both of them, things can feel confusing. You bought …
How a Routine Key Rollover Took Down Germany's Internet: The .de DNSSEC Outage
On May 5, 2026, millions of .de domains became unreachable across large portions of the internet. The cause was not a cyberattack, not a cable cut, an…
How to set up DKIM for Zoho Mail
Originally published on mailermonk.com . Cross-posted here for reach — the canonical version lives on MailerMonk. About this guide Zoho Mail is a budg…
How DNS Resolution Works: From `dig . NS` to Your Browser Loading Google
Every time you type google.com into a browser, something remarkable happens in milliseconds — a global, distributed lookup system translates that huma…
AdGuard Home: Network-Wide DNS Filtering with Failover
DNS is the single point of failure that makes everyone in the house complain that "the internet is down" when, in reality, your DNS container just cra…