Guides
SSL, DNS & domain monitoring guides
Evergreen how-tos: how to check certificate expiry, what happens when things lapse, and how to automate monitoring so you hear about problems before your users do.
How to Check SSL Certificate Expiration: Browser, OpenSSL, curl & Online
Four reliable ways to check when an SSL certificate expires — in your browser, with OpenSSL, with curl, or with a free online checker — plus what the expiry date actually means.
Read guide →How Long Do SSL Certificates Last? Validity in 2026 and the Road to 47 Days
Public TLS certificates last 200 days max since March 2026, dropping to 100 days in 2027 and 47 days in 2029. What the CA/Browser Forum timeline means for renewal automation.
Read guide →What Happens When an SSL Certificate Expires?
Browser warnings, failed API calls, dropped search rankings, and broken integrations — exactly what breaks when a certificate lapses, and how to recover fast.
Read guide →How to Monitor Domain Expiration: WHOIS, RDAP & Renewal Alerts
How to check any domain's expiry date with WHOIS and RDAP, what grace and redemption periods actually give you, and how to automate renewal reminders.
Read guide →DNS Monitoring Guide: Which Records to Watch and How to Detect Changes
A practical guide to monitoring DNS records — A, AAAA, CNAME, MX, TXT, NS, CAA, and SOA — with diff-based change detection that catches hijacks and bad pushes.
Read guide →How to Monitor SSL Certificate Expiration
How to monitor SSL certificate expiration properly: check frequency, 60/30/14/7/1-day alert thresholds, chain validation, CT logs — and what to demand from a monitoring tool.
Read guide →How to Check DNS Records: dig, nslookup & Online Lookup
How to look up any domain's DNS records with dig, nslookup, and free online tools — A, MX, TXT, NS, CAA — and how to read what comes back.
Read guide →What Happens When a Domain Expires? Grace, Redemption & Recovery
When a domain expires, the site, mail, and subdomains go dark — then grace, redemption, and auction. Exact timeline, costs, and how to never get there.
Read guide →Certificate Transparency Monitoring: Catch Unauthorized Issuance
Certificate Transparency logs record every public certificate. How to monitor them for certificates issued for your domains that you never requested.
Read guide →How to Automate SSL Renewal with ACME and Certbot
Stop renewing certificates by hand: ACME, Certbot, DNS-01 vs HTTP-01 challenges, deployment hooks, and why automation still needs independent monitoring.
Read guide →SPF, DKIM & DMARC Monitoring: Keep Email Deliverable
How SPF, DKIM, and DMARC records work, how to check them, and how to monitor the TXT records so vendor changes and typos never silently kill deliverability.
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