Recursive DNS Server Fingerprint
Recursive DNS Server Fingerprint launched on April 21, 2017 with 120 votes, #313 of 3,007 launches that month and more than 95% of that year's launches. The site was still online in September 2026, 9 years on.
In plain words
Recursive DNS Server Fingerprint is a tool that detects compromised open DNS resolvers by analyzing their response patterns to DNS queries. It uses data from RIPE Atlas to identify resolvers that have been hijacked for malicious purposes, such as redirecting users to harmful sites or censoring content. The tool helps improve internet safety by recognizing characteristic differences in how compromised servers respond compared to legitimate ones.
written from the facts on this page · September 2026
From the sources
Google and a few other companies provide open dns resolvers to the people around the globe. Unfortunately it may happen that the resolver was hijacked and used for different purposes, such as redirecting to malicious pages or to block certain addresses (censorship). Our goal is to identify hijacked resolvers by analyzing their fingerprints, in order to increase safety of Internet users. To do that, we utilize data collected via RIPE Atlas (atlas.ripe.net). Our solution to the problem is based on observing characteristic features in replies to DNS queries. A hijacked server will likely run different software than the legitimate server, thus it should be possible to spot some small…from recdnsfp.github.io
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