shell:$ nslookup -timeout=2 -retry=1 'gov.sg'
;; Got SERVFAIL reply from 1.1.1.1, trying next server
Server:		8.8.8.8
Address:	8.8.8.8#53

Non-authoritative answer:
Name:	gov.sg
Address: 76.223.1.167
Name:	gov.sg
Address: 13.248.131.96
;; Got SERVFAIL reply from 1.1.1.1, trying next server
Name:	gov.sg
Address: 2404:5800:105:153::2