+$TTL 300
+@ IN SOA ns root (
+ 2019102901 ; Serial
+ 4h ; slave refresh
+ 15m ; slave retry time in case of a problem
+ 4w ; slave expiration time
+ 300 ; maximum caching time in case of failed lookups (5 minutes)
+ )
+ IN NS ns3.dehnerts.com.
+ IN NS olinda.mit.edu.
+ IN DNAME dynamic.dehnerts.com.