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Insights, comparisons, and best practices on website monitoring, uptime checking, and site reliability.

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Showing 12 of 137 articles
Domain Intelligence
April 12, 2026•4 min read•
Morten PradsgaardMorten Pradsgaard

Catching DNS Hijacks Without Crying Wolf

Most uptime monitors check whether a site responds. Fewer check whether the site responding is actually yours. Here's the simple pattern we use to detect DNS hijacks without alerting on every legitimate record change.

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Incident Management
April 12, 2026•5 min read•
Morten PradsgaardMorten Pradsgaard

The Night We Almost Paged 10,000 People Because Our Own VPS Blinked

When a thousand unrelated sites all fail in the same second, the problem is almost never a thousand unrelated sites. Here's how we built a circuit breaker for our own alerts — and why every monitoring system needs one.

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Server & Infrastructure Monitoring
April 12, 2026•6 min read•
Morten PradsgaardMorten Pradsgaard

Engineering Internals: A 20-Line Semaphore and a Scheduler That Barely Touches the Database

Two small but load-bearing pieces of code from our check runner: a lock-free semaphore that fits on a napkin, and an in-memory schedule that cut our database reads by over 99%.

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Domain Intelligence
April 9, 2026•5 min read•
Morten PradsgaardMorten Pradsgaard

Free CAA Record Check — Verify Certificate Authority Restrictions

Check CAA records to see which CAs can issue SSL certificates.

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Domain Intelligence
April 7, 2026•4 min read•
Morten PradsgaardMorten Pradsgaard

Free DMARC Checker — Check Your Domain's Email Policy

Check if your domain has a DMARC policy to prevent impersonation.

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Domain Intelligence
April 6, 2026•3 min read•
Morten PradsgaardMorten Pradsgaard

Free SPF Record Checker — Verify Your Email Authentication

Check if your domain has a valid SPF record to prevent email spoofing.

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Domain Intelligence
April 4, 2026•4 min read•
Morten PradsgaardMorten Pradsgaard

Free TXT Record Lookup — Check TXT Records for Any Domain

Look up TXT records to check SPF, verification, and more.

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Domain Intelligence
April 3, 2026•4 min read•
Morten PradsgaardMorten Pradsgaard

Free Nameserver Lookup — Find NS Records for Any Domain

Look up NS records to find a domain's authoritative nameservers.

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Domain Intelligence
April 2, 2026•5 min read•
Morten PradsgaardMorten Pradsgaard

Free CNAME Lookup Tool — Check CNAME Records for Any Domain

Look up CNAME records to see where a domain is aliased.

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AI & Automation
March 31, 2026•3 min read•
Morten PradsgaardMorten Pradsgaard

MCP Is Here: Query Your Monitors from Claude, Cursor, VS Code & More

Connect exit1.dev to your AI assistant via the Model Context Protocol. Ask about uptime, failures, and response times in plain English.

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Domain Intelligence
March 31, 2026•4 min read•
Morten PradsgaardMorten Pradsgaard

Free MX Record Lookup — Find Mail Servers for Any Domain

Look up MX records to find any domain's mail servers.

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Domain Intelligence
March 28, 2026•4 min read•
Morten PradsgaardMorten Pradsgaard

Free A Record Lookup — Find the IP Address of Any Domain

Look up A records to find any domain's IPv4 address.

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