DNS
Browse all articles, tutorials, and guides about DNS
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DNS Detective: an Agent That Diagnoses Your Domain by Actually Probing It
We built an agent on DigitalOcean's Serverless Inference that debugs DNS, TLS and email problems the way an engineer does: form a hypothesis, run a real lookup, follow the evidence. It solved a null-MX mystery, an expired certificate, and a broken DNSSEC chain on camera, and one model we tried got disqualified for inventing probe results.
From DNS to Delivery: Building Transactional Email with SMTPFast
Connect a domain, send a FastAPI receipt through SMTPFast, trace delivery beyond the 200 response, and verify signed webhooks end to end.
DMARCbis Is Here: What Changed in the New DMARC and What to Do to Your Records
DMARC finally became a real internet standard in 2026. The pct tag is gone, there are two new tags, and the Public Suffix List is out. Here is what actually changed and the exact edits to make to your DNS.
node-ipc DNS-Tunneling Supply Chain Attack: Your Egress Firewall Probably Missed This
On May 14, 2026, three malicious versions of the node-ipc npm package shipped a payload that hunts AWS, SSH, kubeconfig, and GitHub CLI credentials, then smuggles them out through DNS TXT queries. Most orgs filter HTTPS egress. Almost nobody filters DNS. Here is what the payload does and how to close the gap.
How to Fix SSH "Could Not Resolve Hostname" Error
Troubleshoot and fix the SSH 'nodename nor servname provided, or not known' error with DNS checks, host file configuration, and SSH config debugging.