Delegating sub-domains to other name servers
Look at the following zone file:$TTL 14440 mydomain.com. IN SOA ns1.mydns.com. dnsmaster.mydomain.com. ( 1171914221 ;Serial 10800 ; Refresh 3600 ; Retry 604800 ; Expire 21600 ) ; Minimum TTL mydomain.com. IN NS ns1.mydns.com. mydomain.com. IN NS ns2.mydns.com. www.mydomain.com. IN A 1.2.3.4 mydomain.com. IN A 1.2.3.4 us.mydomain.com. IN NS ns1.otherdns.com. us.mydomain.com. IN NS ns2.otherdns.com.
All host records of *.us.mydomain.com will be queried from ns[12].otherdns.com.
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