Practical guides on DNS records, propagation, and keeping your domains healthy.
DNS Infrastructure
A missing hostname, an absent record type, and a failed DNS lookup can look similar in a browser. Learn how to distinguish NXDOMAIN, NODATA, SERVFAIL, and timeouts, then trace the problem to the right place.
Email Authentication
SPF, DKIM, and DMARC get your mail authenticated and delivered. BIMI is the newer record that turns that authentication into a visible logo next to your messages, and it comes with prerequisites and certificate costs most people don't expect.
DNS Infrastructure
Give a hostname more than one A record and you get the oldest form of load distribution DNS offers. It's also one of the most limited: no health checks, no weighting, and a dead server that stays in rotation until someone notices.
DNS Infrastructure
Automated certificate issuance has to prove you control a domain before handing you a certificate for it. For an ordinary hostname there are a few ways to do that. For a wildcard, there's exactly one: publish a specific DNS TXT record.
DNS Records
A wildcard record answers queries for subdomains that don't exist in your zone at all. That's powerful for multi-tenant platforms and catch-all setups, and genuinely risky for mail. Here's exactly what a wildcard does and doesn't match.
Product Guide
Email works fine until a team stops checking one shared inbox. Team Notifications sends the same DNS change alerts to Slack, Discord, or a webhook instead, so they land wherever your team actually looks first.
DNS Infrastructure
Most domains give everyone the same answer no matter where the query comes from. Split-horizon DNS deliberately doesn't: the same hostname resolves to a different address depending on whether the query originates inside or outside the network.
Product Guide
The default monitoring interval is built for the vast majority of records that rarely change. Frequent Monitoring exists for the small number that can't wait an hour, checking a limited set of priority hosts every 5 minutes instead.
Product Guide
Muting a host's record type stops it from raising alerts or sending notifications, either indefinitely or for a fixed window, without turning off monitoring or hiding the change from your history.
DNS Infrastructure
Azure DNS hands you nameservers on four different TLDs, not four servers under the same one. That's deliberate. Here's the specific failure mode TLD diversity protects against, and why not every major provider bothers with it.