shell:$ nslookup -timeout=2 -retry=1 'mta-sts.dtac.org' Server: 75.98.161.224 Address: 75.98.161.224#53 Non-authoritative answer: Name: mta-sts.dtac.org Address: 13.248.169.48 Name: mta-sts.dtac.org Address: 76.223.54.146