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Life & fun · January 14, 2013

Identifying the DNS server used to fulfill a HTTP request

Identifying the DNS server used to fulfill an HTTP request

Identifying the DNS server used to fulfill a HTTP request launched on January 14, 2013 with 17 votes, #98 of 526 launches that month and more than 75% of that year's launches. The site was still online in September 2026, 13 years on.

Visit 5f5.org ↗Alternativestop 19% of January 2013

In plain words

This tool helps developers identify which DNS server resolved a domain name during an HTTP request. It provides remote debugging capabilities for HTTP issues by allowing developers to share a debug URL with end users and collect diagnostic information including browser details, IP addresses, and request headers. The tool integrates with JavaScript and standard web technologies to gather and display DNS resolution data without requiring additional software installation.

written from the facts on this page · September 2026

From the sources

As developers we have a handful of tools at our disposal for remotely debugging HTTP issues. You can pass along a debug URL to your end users and have them send back the results 1 . From JavaScript we have access to the basics that come along with the user-agent: browser, platform, and versions. It's also easy to include things like their IP and request headers by setting up an endpoint that echos back the request. Put the right headers on that endpoint and you can then include that additional information by way of XHR request. This on its own will get you a good chunk of information: you can infer things like what carrier they're on by the IP, whether the request is being changed in…from 5f5.org

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