Blog
Guides and updates on domains, DNS, SSL, and uptime monitoring.
Uptime monitoring: HTTP vs TCP checks, and how often to run them
Not all uptime checks are equal. Here's the difference between HTTP and TCP monitoring, how to pick check intervals, and what actually counts as "down."
Read article →- SSL
Your SSL certificate is about to expire: a calm checklist
An expired TLS certificate throws a full-page security warning and can take a site down outright. Here's what to check, and how to stop it from happening by surprise.
- DNS
DNS propagation explained: why your change isn't live yet
You updated a DNS record an hour ago and it's still serving the old value. Here's what "propagation" actually is, why TTL controls it, and how to check.
- DNS
DNS change monitoring: catch the change before it breaks something
A single edited DNS record can take a site offline or silently reroute your email. Here's why DNS changes are so easy to miss, and how monitoring catches them early.
- Domains
WHOIS and RDAP: what your domain record actually tells you
WHOIS is more than a registrar name. Here's how to read a domain record — expiry, status codes, nameservers — and why RDAP is quietly replacing it.
- Renewals
How to never miss a domain renewal again
A lapsed domain can take a site offline, break email, and even put your name on the open market. Here's a simple system for tracking renewals across every registrar.
- News
Introducing the Domnr blog
Why we built a fast, crawlable public surface with Astro — and what you can expect to read here.
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