$ORIGIN . $TTL 30 ; 30 seconds {{full_domain}} IN SOA ns.commoninternet.net. root.commoninternet.net. ( 2016062804 ; serial 3600 ; refresh (1 hour) 600 ; retry (10 minutes) 2600 ; expire (43 minutes 20 seconds) 30 ; minimum (30 seconds) ) NS ns.commoninternet.net.