Troubleshooting guides

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Clear, practical explainers for the pieces of the internet that show up during real troubleshooting: DNS records, resolvers, caching, routing symptoms, and what to check next.

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A practical first guide for understanding the signals that show up when the internet is not behaving.

A diagnostic map showing a browser, resolver, and authoritative DNS servers connected by lookup arrows. DNS What Is DNS? Learn what DNS is, how DNS lookups work, and how to troubleshoot common DNS problems with practical checks. DNSTroubleshootingResolversInternet Basics

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Several devices with private IPv4 addresses connecting through a router to one public IPv4 address. IP Addresses Public vs. Private IP Addresses: What's the Difference? Learn which IPv4 address the internet sees, why it differs from your device address, and how NAT or carrier-grade NAT affects the result. IP AddressesIPv4NATTroubleshooting A speed-test dashboard separating ping, download, and upload into three diagnostic signals. Speed Tests What Does a Speed Test Actually Measure? Learn what ping, download, upload, and Mbps really tell you—and how to turn one speed-test result into a useful troubleshooting clue. Speed TestsLatencyBandwidthTroubleshooting A diagnostic map showing a browser, resolver, and authoritative DNS servers connected by lookup arrows. DNS What Is DNS? Learn what DNS is, how DNS lookups work, and how to troubleshoot common DNS problems with practical checks. DNSTroubleshootingResolversInternet Basics