$TTL 60 @ IN SOA dns3.ungleich.ch. root.ungleich.ch. ( 2021021800 ; serial number of this zone file 1d ; slave refresh (1 day) 2h ; slave retry time in case of a problem (2 hours) 4w ; slave expiration time (4 weeks) 1w ; maximum caching time in case of failed lookups (1 hour) ) NS dns1.ungleich.ch. NS dns2.ungleich.ch. NS dns3.ungleich.ch. MX 10 smtp.ungleich.ch. MX 20 mx-backup.ungleich.ch. ; red AAAA 2a0a:e5c1:111:111::42 red AAAA 2a0a:e5c0:13::42 router1 AAAA 2a0a:e5c0:13::42 router2 AAAA 2a0a:e5c0:13:0:20d:b9ff:fe46:3bd4