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“A” records can be:

  • simple subdomain: “subdomain”, points to IP, TTL usually automatic, traffic not through Cloudflare
  • sub-subdomain wildcard (all sub-subdomains go to the one IP): “*.subdomain” + other values the same
  • separate sub-subdomains going to the different IPs: “subsubdomain.subdomain”, IP,… etc.

To see target IP of a domain, subdomain etc. use “dig your.address.xxx”. Command “dig” is part of the package “dnsutils”.