How to Check SPF, DKIM, and DMARC Records in Python
If your app sends email — transactional or marketing — three DNS records decide whether it lands in the inbox or the spam folder: SPF , DKIM , and DMA…
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DNS Round-Robin: The Cheapest Load Balancer Is Three A Records and a Rotating Answer
Originally published at https://blog.pathvector.dev/protocol-lab-dnsrr-41/ — part of the free Protocol Lab series. This post is part of Protocol Lab ,…
Building a Lightweight DNS Exploration Tool in Python
When building out network enumeration tooling, understanding how domain structures map out is a core skill for any security enthusiast or developer. I…
DNS Propagation Time: How Long Until Your DNS Change Goes Live?
You change the A record for api.example.com from 203.0.113.10 to 203.0.113.20`. Your browser shows the new IP. The deployment dashboard says green. Th…
А мой веб-сервер точно нормально работает?
У меня есть сервер в интернете, который работает с HTTP/2, HTTP/3, с IPv4 и IPv6… Как всё это хозяйство протестировать? Я не нашёл решение и прибёг к …
97.8% of the top 10,000 domains have no MTA-STS. Here's how to be in the other 2%
Of the 10,000 most-visited domains on the web, 97.8% have no MTA-STS policy at all. Not misconfigured. Not weak. Just absent. I scanned the Tranco top…
DNS Explained: How Your Browser Decodes Website Addresses
You type www.google.com into your browser and hit Enter. The page loads in under a second. But stop and think about what just happened. Your browser d…
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…
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…
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 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…
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…