a2sys.co.kr.		30 IN SOA ns3.dnszi.com. root.dnszi.com. (
				2021030401 ; serial
				43200      ; refresh (12 hours)
				3600       ; retry (1 hour)
				1209600    ; expire (2 weeks)
				7200       ; minimum (2 hours)
				)

a2sys.co.kr.		30 IN TXT "v=spf1 include:a2sys.co.kr ~all"

a2sys.co.kr.		30 IN A	49.165.154.28

Mail exchangers:
a2sys.co.kr.		30 IN MX 10 mx.yandex.ru.

Name servers:
a2sys.co.kr.		30 IN NS ns51.dnszi.com.
a2sys.co.kr.		30 IN NS ns18.dnszi.com.
a2sys.co.kr.		30 IN NS ns62.dnszi.com.
a2sys.co.kr.		30 IN NS ns3.dnszi.com.
a2sys.co.kr.		30 IN NS ns74.dnszi.com.