The following is an SOA record obtained via a zone transfer: What is the name of the domain's authoritative DNS server, and how frequently will secondary servers check in for updates?

The SOA always begins by defining the authoritative server (in this example, DNSRV1), followed by e-mail contact information along with a few additional items. The refresh time specifies how frequently secondary servers will check for updates—in this example, 3,600 seconds (1 hour).