shell:$ nslookup -timeout=2 -retry=1 '5643555.fls.doubleclick.net'
Server:		127.0.0.53
Address:	127.0.0.53#53

Non-authoritative answer:
5643555.fls.doubleclick.net	canonical name = dart.l.doubleclick.net.
Name:	dart.l.doubleclick.net
Address: 142.250.139.148
Name:	dart.l.doubleclick.net
Address: 142.250.139.149