shell:$ nslookup -timeout=2 -retry=1 'v19-vcheckout.muscdn.com'
Server:		1.1.1.1
Address:	1.1.1.1#53

Non-authoritative answer:
v19-vcheckout.muscdn.com	canonical name = video.bytedance.map.fastly.net.
Name:	video.bytedance.map.fastly.net
Address: 146.75.10.73