shell:$ nslookup -timeout=2 -retry=1 'a.rtmp.youtube.com'
Server:		75.98.161.224
Address:	75.98.161.224#53

Non-authoritative answer:
Name:	a.rtmp.youtube.com
Address: 172.217.4.204
Name:	a.rtmp.youtube.com
Address: 142.250.191.140
Name:	a.rtmp.youtube.com
Address: 142.250.191.108
Name:	a.rtmp.youtube.com
Address: 142.250.190.140
Name:	a.rtmp.youtube.com
Address: 142.250.190.12
Name:	a.rtmp.youtube.com
Address: 142.251.32.12
Name:	a.rtmp.youtube.com
Address: 142.250.190.108
Name:	a.rtmp.youtube.com
Address: 172.217.2.44
Name:	a.rtmp.youtube.com
Address: 172.217.4.76
Name:	a.rtmp.youtube.com
Address: 142.250.190.76
Name:	a.rtmp.youtube.com
Address: 142.250.190.44
Name:	a.rtmp.youtube.com
Address: 142.250.191.236
Name:	a.rtmp.youtube.com
Address: 142.250.191.172
Name:	a.rtmp.youtube.com
Address: 142.250.191.204
Name:	a.rtmp.youtube.com
Address: 172.217.5.12
Name:	a.rtmp.youtube.com
Address: 2607:f8b0:4009:807::200c
Name:	a.rtmp.youtube.com
Address: 2607:f8b0:4009:808::200c
Name:	a.rtmp.youtube.com
Address: 2607:f8b0:4009:809::200c
Name:	a.rtmp.youtube.com
Address: 2607:f8b0:4009:805::200c