extension.co.kr.	30 IN SOA extension.co.kr. postmaster.extension.co.kr. (
				20050571   ; serial
				10800      ; refresh (3 hours)
				3600       ; retry (1 hour)
				3600000    ; expire (5 weeks 6 days 16 hours)
				43200      ; minimum (12 hours)
				)

extension.co.kr.	30 IN TXT "v=spf1 mx a ip4:218.145.65.146 include:fmcity.com
~all"

extension.co.kr.	30 IN A	183.111.174.33

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

Name servers:
extension.co.kr.	30 IN NS ns2.extension.co.kr.
extension.co.kr.	30 IN NS ns1.extension.co.kr.
extension.co.kr.	30 IN NS ns.extension.co.kr.
extension.co.kr.	30 IN NS ns3.extension.co.kr.