You can set a rather complex set of rules for the existence of absence of certain resource records or names in a zone to specify if resource records should be added or removed. The table from RFC 2136 supplemented with the Go DNS function shows which functions exist to specify the prerequisites.

The Domain Name System (DNS) is a hierarchical and decentralized naming system for computers, services, or other resources connected to the Internet or a private network. It associates various information with domain names assigned to each of the participating entities. Most prominently, it translates more readily memorized domain names to the numerical IP addresses needed for locating … How to Find Out What DNS Servers Your PC, Mobile, and What DNS you are using on Windows 10/8/7/XP. Checking the DNS Servers on your Windows device … What is DNS? and How Does DNS Work? (Explained for Beginners) DNS stands for “Domain Name System”. It’s a system that lets you connect to websites by matching human-readable domain names (like wpbeginner.com) with the unique ID of the server where a website is stored. Think of the DNS system as the internet’s phonebook. What is DNS and how does it work? | Network World

src/net/dnsclient_unix.go - The Go Programming Language

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