shell:$ nslookup -timeout=2 -retry=1 'https.speedtestcustom.com'
Server:		127.0.0.53
Address:	127.0.0.53#53

Non-authoritative answer:
https.speedtestcustom.com	canonical name = zd.map.fastly.net.
Name:	zd.map.fastly.net
Address: 151.101.2.219
Name:	zd.map.fastly.net
Address: 151.101.66.219
Name:	zd.map.fastly.net
Address: 151.101.130.219
Name:	zd.map.fastly.net
Address: 151.101.194.219