Internet troubleshooting workbench
MakeTheInternetGo
Fast browser-based tools for DNS, IPs, speed, subnet math, and the small checks that turn network weirdness into something you can actually debug.
Quick check
Run a DNS lookup
Opens the full DNS checker and starts the lookup there.
Tools
Choose the next check
Pick the browser-based check that matches the problem you are trying to isolate.
DNS Lookup Check a name, record type, and resolver from every configured region. Speed Test Measure latency, download, and upload from this browser to the edge. My IP Confirm the public IPv4 address websites see from this browser. Subnet Calculator Calculate IPv4 network, broadcast, mask, host count, and usable range.
Learn
Evergreen troubleshooting guides
Stable explainers for DNS, speed, IPs, records, caching, and the mental models behind the tools.
What Is DNS? Learn what DNS is, how DNS lookups work, and how to troubleshoot common DNS problems with practical checks. DNSTroubleshootingResolversInternet Basics Blog
Field notes and updates
Timely notes, release updates, observations, and opinion from the workbench side of internet troubleshooting.
Why DNS Can Resolve Differently Around the World A practical look at why the same hostname can return different DNS answers in different places, when that is useful, and when it points to a real configuration problem. DNSTroubleshootingGlobal Load Balancing