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SNI Acquisition Basic Steps

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    1. Check if Tls1.3 is supported. Right-click inspect and click on security to see if it is TLS1.3.
    1. Check if the H2 protocol is supported Open the console and type:
window.chrome.loadTimes()? .npnNegotiatedProtocol

The output should be “h2”

  • 3. Check whether CDN is applied or not Add /cdn-cgi/trace after the target site domain (only CF is detected), and You can also use this website cdnfinder to find out
    1. Connectivity detection in China Open itdog and enter the domain name to see if it is walled or not (actually this step should be the first to do…)
    1. How to query neighbors under the same ASN? ASN query tool, target site query tool, target site query tool, target site query tool target site query tool fofa
  • fofa query rule. asn=="ASN number e.g.:11451" && country=="VPS country e.g.:US,JP,SG" && port=="443" && cert!="Let's Encrypt" && cert.issuer!="ZeroSSL" && status_code="200"