ittower.kr.		30 IN SOA ns1.realsoft.co.kr. root.realsoft.co.kr. (
				2019020100 ; serial
				3600       ; refresh (1 hour)
				15         ; retry (15 seconds)
				604800     ; expire (1 week)
				300        ; minimum (5 minutes)
				)

ittower.kr.		30 IN TXT "v=spf1 ip4:117.52.155.71 ~all"

ittower.kr.		30 IN A	117.52.155.71

Mail exchangers:
ittower.kr.		30 IN MX 10 mail.ittower.kr.

Name servers:
ittower.kr.		30 IN NS ns2.realsoft.co.kr.
ittower.kr.		30 IN NS ns1.realsoft.co.kr.