123456789.co.kr.	30 IN SOA 123456789.co.kr. postmaster.123456789.co.kr. (
				20180503   ; serial
				10800      ; refresh (3 hours)
				3600       ; retry (1 hour)
				3600000    ; expire (5 weeks 6 days 16 hours)
				43200      ; minimum (12 hours)
				)

123456789.co.kr.	30 IN TXT "v=spf1 ip4:112.175.93.2 ~all"

123456789.co.kr.	30 IN A	112.175.93.2

Mail exchangers:
123456789.co.kr.	30 IN MX 10 123456789.co.kr.

Name servers:
123456789.co.kr.	30 IN NS ns3.cafe24dns.co.kr.
123456789.co.kr.	30 IN NS ns1.cafe24dns.co.kr.