shell:$ nslookup -timeout=2 -retry=1 'fb.adsrvr.org'
Server:		127.0.0.53
Address:	127.0.0.53#53

Non-authoritative answer:
fb.adsrvr.org	canonical name = ny1-bid.adsrvr.org.
Name:	ny1-bid.adsrvr.org
Address: 199.250.161.129