shell:$ nslookup -timeout=2 -retry=1 'img.youtube.com'
Server:		1.1.1.1
Address:	1.1.1.1#53

Non-authoritative answer:
img.youtube.com	canonical name = ytimg.l.google.com.
Name:	ytimg.l.google.com
Address: 172.253.132.139
Name:	ytimg.l.google.com
Address: 172.253.132.113
Name:	ytimg.l.google.com
Address: 172.253.132.100
Name:	ytimg.l.google.com
Address: 172.253.132.101
Name:	ytimg.l.google.com
Address: 172.253.132.138
Name:	ytimg.l.google.com
Address: 172.253.132.102
Name:	ytimg.l.google.com
Address: 2607:f8b0:4023:2c03::64
Name:	ytimg.l.google.com
Address: 2607:f8b0:4023:2c03::65
Name:	ytimg.l.google.com
Address: 2607:f8b0:4023:2c03::66
Name:	ytimg.l.google.com
Address: 2607:f8b0:4023:2c03::8a