shell:$ nslookup -timeout=2 -retry=1 'calendar.notion.so'
Server:		1.1.1.1
Address:	1.1.1.1#53

Non-authoritative answer:
Name:	calendar.notion.so
Address: 208.103.161.2
Name:	calendar.notion.so
Address: 208.103.161.1
Name:	calendar.notion.so
Address: 2602:f79a::2
Name:	calendar.notion.so
Address: 2602:f79a::1