firstserver.ne.jp.	30 IN SOA ns-2018.awsdns-60.co.uk. awsdns-hostmaster.amazon.com. (
				1          ; serial
				7200       ; refresh (2 hours)
				900        ; retry (15 minutes)
				1209600    ; expire (2 weeks)
				86400      ; minimum (1 day)
				)

Mail exchangers:
firstserver.ne.jp.	30 IN MX 100 mail.firstserver.ne.jp.

Name servers:
firstserver.ne.jp.	30 IN NS ns-1237.awsdns-26.org.
firstserver.ne.jp.	30 IN NS ns-2018.awsdns-60.co.uk.
firstserver.ne.jp.	30 IN NS ns-448.awsdns-56.com.
firstserver.ne.jp.	30 IN NS ns-918.awsdns-50.net.