kr.nus.edu.sg.		30 IN SOA ns1.nus.edu.sg. ccenet.nus.edu.sg. (
				2018081804 ; serial
				3600       ; refresh (1 hour)
				1800       ; retry (30 minutes)
				604800     ; expire (1 week)
				600        ; minimum (10 minutes)
				)

kr.nus.edu.sg.		30 IN TXT "v=spf1 include:_spf.google.com ~all"

kr.nus.edu.sg.		30 IN A	172.18.174.230

Mail exchangers:
kr.nus.edu.sg.		30 IN MX 10 aspmx3.googlemail.com.
kr.nus.edu.sg.		30 IN MX 10 aspmx2.googlemail.com.
kr.nus.edu.sg.		30 IN MX 5 alt2.aspmx.l.google.com.
kr.nus.edu.sg.		30 IN MX 5 alt1.aspmx.l.google.com.
kr.nus.edu.sg.		30 IN MX 1 aspmx.l.google.com.

Name servers:
kr.nus.edu.sg.		30 IN NS ns1.nus.edu.sg.
kr.nus.edu.sg.		30 IN NS ns2.nus.edu.sg.