$TTL 3600 @ IN SOA in.thelinuxpro.net. hostmaster.in.thelinuxpro.net. ( 24042001 ; serial 21600 ; refresh after 6 hours 3600 ; retry after 1 hour 604800 ; expire after 1 week 86400 ) ; minimum TTL of 1 day ; @ IN NS ns1.thelinuxpro.net. @ IN NS ns2.thelinuxpro.net. ; 241.53 IN PTR dns01 242.53 IN PTR dns02 243.53 IN PTR dns03 250.53 IN PTR pihole 251.53 IN PTR 1.ntp 252.53 IN PTR 2.ntp 222.99 IN PTR maverick 226.99 IN PTR print 230.99 IN PTR diskstation 231.99 IN PTR nas81 254.99 IN PTR gw99 254.254 IN PTR unifi