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After you create a hosted zone for a specified domain, for example, example.com, you create resource record sets to tell the Domain Name System how you want traffic to be routed for that domain. You might create resource record sets that cause DNS to route Internet traffic for example.com to the IPv4 or IPv6 address of a host in your data center, route email for that domain (firstname.lastname@example.org) to a mail server (mail.example.com), and route traffic for a subdomain called operations.tokyo.example.com to the IPv4 or IPv6 address of a different host. Each resource record set includes the name of a domain or a subdomain, a record type (for example, an MX record routes email), and other information applicable to the record type (for MX records, the host name of a mail server and the priority of that server). For information about the different types of resource records, see DNS Domain Name Format.
The name of each resource record set in a hosted zone must end with the name of the hosted zone. For example, the example.com hosted zone can contain resource record sets for www.example.com and accounting.tokyo.example.com subdomains, but cannot contain resource record sets for a www.example.ca subdomain.