; /etc/bind/zones/example.com ; Example zone file for example.com $TTL 3600 @ IN SOA ns1.example.com. hostmaster.example.com. ( 2025012101 ; serial (format: YYYYMMDDXX) 7200 ; refresh (2 hours) 900 ; retry (15 minutes) 1209600 ; expire (2 weeks) 86400 ; minimum TTL (1 day) ) ; NS Records @ 3600 IN NS ns1.example.com. @ 3600 IN NS ns2.example.com. ; A Records @ 3600 IN A 192.0.2.10 www 3600 IN A 192.0.2.11 app 3600 IN A 192.0.2.12 mail 3600 IN A 192.0.2.13 ns1 3600 IN A 192.0.2.14 ns2 3600 IN A 192.0.2.15 chat 3600 IN A 192.0.2.16 monitor 3600 IN A 192.0.2.17 ; TXT Records @ 3600 IN TXT "v=spf1 mx -all" ; Email Related Records @ 3600 IN MX 10 mail.example.com. _dmarc 3600 IN TXT "v=DMARC1; p=reject; pct=100; fo=1; rua=mailto:dmarc@example.com"