howto: Internet - DNS                   rev 12 apr 2022

  * see what dns is being used at your computer:
      $ systemd-resolve --status

  Also: How to tell what DNS servers i am using?
      https://unix.stackexchange.com/questions/28941/what-dns-servers-am-i-using
      detailed explanations.
      [jan 2012 / last edits 2022 / retr 12 apr 2022]


  * see what dns is being used for a website:
      $  host -t ns domain.tld
      $  dig ns domain.tld
      $  whois domain.tld       # will show what nameserver is at registrar
      https://www.websitepulse.com/tools/ns-records-lookup-test
                        # looks like also shows what is at registrar.

      More at 
      https://www.websitepulse.com/tools/
      https://www.hostinger.com/tutorials/how-to-check-nameservers
      https://www.websitepulse.com/blog/how-to-check-a-name-server

  * About using different DNS service
      official title: Primer: When (and how) to dump your Internet provider’s DNS service
      good info.
      https://the-parallax.com/2019/04/04/how-change-dns/
      [4 apr 2019; accessed 17 jul 2019]

  * What does my ISP see if I change my DNS server?
      https://security.stackexchange.com/questions/239407/what-does-my-isp-see-if-i-change-my-dns-server 
      detailed explanations.
      [oct 2020 / retr 22 oct 2020]


.........................
hosts file:

  * browser not using hosts file (really annoying!)
      https://duckduckgo.com/?q=browser+not+using+hosts+file
      https://stackoverflow.com/questions/37452361/why-is-my-hosts-file-entry-being-ignored-by-the-browser
      https://stackoverflow.com/questions/42636711/google-chrome-ignoring-hosts-file
      https://support.mozilla.org/en-US/questions/1011327
      [may 2021]



.........................
SPF / DKIM records:

  See cloudflare settings file 
    process-website-cloudflare-settings.txt
  [jun 2021]



.........................
resources:

  - Learning about DNS
      https://www.cloudflare.com/learning/dns/


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