shell:$ nslookup -timeout=2 -retry=1 'dnsbl.spfbl.net' Server: 75.98.161.224 Address: 75.98.161.224#53 Non-authoritative answer: Name: dnsbl.spfbl.net Address: 54.233.253.229 Name: dnsbl.spfbl.net Address: 2600:1f1e:4b3:bd00::4