shell:$ nslookup -timeout=2 -retry=1 'sf19-webcast.muscdn.com'
Server:		1.1.1.1
Address:	1.1.1.1#53

Non-authoritative answer:
sf19-webcast.muscdn.com	canonical name = bytedance.map.fastly.net.
Name:	bytedance.map.fastly.net
Address: 146.75.10.73