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