我有一个来自 Youtube 视频的音频流youtube-dl -g <URL>（此命令输出两个链接，分别用于视频和音频）。他们有这样的形式；https://rr1---sn-uqx2-w50l.googlevideo.com/videoplayback?...。
的iprr1---sn-uqx2-w50l.googlevideo.com是181.64.63.12
> ping rr1---sn-uqx2-w50l.googlevideo.com
Pinging rr1.sn-uqx2-w50l.googlevideo.com [181.64.63.12] with 32 bytes of data:
Reply from 181.64.63.12: bytes=32 time=11ms TTL=123
Reply from 181.64.63.12: bytes=32 time=10ms TTL=123
Reply from 181.64.63.12: bytes=32 time=10ms TTL=123
Reply from 181.64.63.12: bytes=32 time=11ms TTL=123
当我在vlcnetstat -an上播放此链接时运行，但此 ip 没有显示，这是为什么？（我在 Windows 10 上）
> netstat -an
Active Connections
Proto Local Address Foreign Address State
TCP 0.0.0.0:53 0.0.0.0:0 LISTENING
TCP 0.0.0.0:80 0.0.0.0:0 LISTENING
TCP 0.0.0.0:135 0.0.0.0:0 LISTENING
TCP 0.0.0.0:443 0.0.0.0:0 LISTENING
TCP 0.0.0.0:445 0.0.0.0:0 LISTENING
TCP 0.0.0.0:554 0.0.0.0:0 LISTENING
TCP 0.0.0.0:1536 0.0.0.0:0 LISTENING
TCP 0.0.0.0:1537 0.0.0.0:0 LISTENING
TCP 0.0.0.0:1538 0.0.0.0:0 LISTENING
TCP 0.0.0.0:1539 0.0.0.0:0 LISTENING
TCP 0.0.0.0:1540 0.0.0.0:0 LISTENING
TCP 0.0.0.0:1542 0.0.0.0:0 LISTENING
TCP 0.0.0.0:2090 0.0.0.0:0 LISTENING
TCP 0.0.0.0:2869 0.0.0.0:0 LISTENING
TCP 0.0.0.0:3306 0.0.0.0:0 LISTENING
TCP 0.0.0.0:5040 0.0.0.0:0 LISTENING
TCP 0.0.0.0:5357 0.0.0.0:0 LISTENING
TCP 0.0.0.0:8000 0.0.0.0:0 LISTENING
TCP 0.0.0.0:9443 0.0.0.0:0 LISTENING
TCP 0.0.0.0:10243 0.0.0.0:0 LISTENING
TCP 0.0.0.0:33060 0.0.0.0:0 LISTENING
TCP 127.0.0.1:5939 0.0.0.0:0 LISTENING
TCP 127.0.0.1:8631 127.0.0.1:8632 ESTABLISHED
TCP 127.0.0.1:8632 127.0.0.1:8631 ESTABLISHED
TCP 169.254.121.209:139 0.0.0.0:0 LISTENING
TCP 169.254.123.68:139 0.0.0.0:0 LISTENING
TCP 172.27.64.1:139 0.0.0.0:0 LISTENING
TCP 172.27.192.1:139 0.0.0.0:0 LISTENING
TCP 192.168.1.18:139 0.0.0.0:0 LISTENING
TCP 192.168.1.18:1687 198.252.206.25:443 ESTABLISHED
TCP 192.168.1.18:1733 198.252.206.25:443 ESTABLISHED
TCP 192.168.1.18:1777 38.90.226.39:80 CLOSE_WAIT
TCP 192.168.1.18:1813 172.217.146.201:443 ESTABLISHED
TCP 192.168.1.18:1822 172.64.148.218:443 ESTABLISHED
TCP 192.168.1.18:1824 192.16.49.85:80 TIME_WAIT
TCP 192.168.1.18:1825 108.158.107.120:80 TIME_WAIT
TCP 192.168.1.18:1826 2.20.144.232:80 TIME_WAIT
TCP 192.168.1.18:1828 142.250.78.97:443 ESTABLISHED
TCP 192.168.1.18:1830 217.160.86.51:443 TIME_WAIT
TCP 192.168.1.18:1832 217.160.86.59:443 TIME_WAIT
TCP 192.168.1.18:1833 142.250.78.74:443 ESTABLISHED
TCP 192.168.1.18:1838 217.160.86.61:443 TIME_WAIT
TCP 192.168.1.18:1839 217.160.86.59:443 TIME_WAIT
TCP 192.168.1.18:1841 217.160.86.61:443 CLOSE_WAIT
TCP 192.168.1.18:1843 217.160.86.82:443 TIME_WAIT
TCP 192.168.1.18:1844 157.240.197.15:443 ESTABLISHED
TCP 192.168.1.18:1845 192.16.49.85:80 ESTABLISHED
TCP 192.168.1.18:1846 157.240.197.35:443 ESTABLISHED
TCP 192.168.1.18:1848 217.160.86.51:443 ESTABLISHED
TCP [::]:53 [::]:0 LISTENING
TCP [::]:80 [::]:0 LISTENING
TCP [::]:135 [::]:0 LISTENING
TCP [::]:443 [::]:0 LISTENING
TCP [::]:445 [::]:0 LISTENING
TCP [::]:554 [::]:0 LISTENING
TCP [::]:1536 [::]:0 LISTENING
TCP [::]:1537 [::]:0 LISTENING
TCP [::]:1538 [::]:0 LISTENING
TCP [::]:1539 [::]:0 LISTENING
TCP [::]:1540 [::]:0 LISTENING
TCP [::]:1542 [::]:0 LISTENING
TCP [::]:2090 [::]:0 LISTENING
TCP [::]:2869 [::]:0 LISTENING
TCP [::]:3306 [::]:0 LISTENING
TCP [::]:5357 [::]:0 LISTENING
TCP [::]:8000 [::]:0 LISTENING
TCP [::]:9443 [::]:0 LISTENING
TCP [::]:10243 [::]:0 LISTENING
TCP [::]:33060 [::]:0 LISTENING
TCP [::1]:53 [::]:0 LISTENING
TCP [::1]:80 [::]:0 LISTENING
TCP [::1]:443 [::]:0 LISTENING
TCP [::1]:1541 [::]:0 LISTENING
TCP [::1]:8000 [::]:0 LISTENING
TCP [::1]:9443 [::]:0 LISTENING
UDP 0.0.0.0:53 *:*
UDP 0.0.0.0:53 *:*
UDP 0.0.0.0:123 *:*
UDP 0.0.0.0:500 *:*
UDP 0.0.0.0:3702 *:*
UDP 0.0.0.0:3702 *:*
UDP 0.0.0.0:3702 *:*
UDP 0.0.0.0:3702 *:*
UDP 0.0.0.0:4500 *:*
...
更新：
在图像中（我仅显示运行netstat时的差异），左侧是打开的vlc，没有任何连接，右侧有连接。我们可以用红色看到差异。
所以只建立了一个连接。那是 CDN 吗？总是只有一个 CDN 连接吗？