shell:$ nslookup -timeout=2 -retry=1 'debian.pool.ntp.org'
Server:		75.98.161.224
Address:	75.98.161.224#53

Non-authoritative answer:
Name:	debian.pool.ntp.org
Address: 162.244.81.139
Name:	debian.pool.ntp.org
Address: 193.29.63.226
Name:	debian.pool.ntp.org
Address: 172.104.209.204
Name:	debian.pool.ntp.org
Address: 73.185.182.209