nexus-4.es.		30 IN SOA nameserver1.serlib.com. root.nameserver1.serlib.com. (
				1604506253 ; serial
				3600       ; refresh (1 hour)
				600        ; retry (10 minutes)
				1209600    ; expire (2 weeks)
				3600       ; minimum (1 hour)
				)

nexus-4.es.		30 IN TXT "v=spf1 a mx a:nexus-4.es ip4:51.91.105.97
ip6:2001:41d0:0203:6761:: ?all"

nexus-4.es.		30 IN A	51.91.105.97

Mail exchangers:
nexus-4.es.		30 IN MX 5 mail.nexus-4.es.

Name servers:
nexus-4.es.		30 IN NS nameserver2.serlib.com.
nexus-4.es.		30 IN NS ns2.serlib.com.
nexus-4.es.		30 IN NS ns1.serlib.com.