• The top-level entry of a DNS zone, represented by the bare domain name without any subdomain prefix (e.g., “example.com” rather than “www.example.com”). It is identified in DNS by the “@” symbol and can only hold certain record types (such as A, AAAA, and NS), which is why CNAME records are not permitted as per RFC 1912.

1. Related terms: Zone file, CNAME flattening, Root zone, NS
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