reference Comodo Secure DNS server

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    name: reference Comodo Secure DNS server
    namespace: communication/dns
    authors:
      - william.ballenthin@mandiant.com
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      dynamic: thread
    references:
      - https://www.techradar.com/news/best-dns-server
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    - or:
      - string: "8.26.56.26"
      - string: "8.20.247.20"