答案1
这意味着该网站未解析 ip6 地址,例如 github.com 具有相同的地址:
$ ping -4 github.com
PING github.de (140.82.114.18) 56(84) bytes of data.
64 bytes from lb-140-82-114-18-iad.github.com (140.82.114.18): icmp_seq=1 ttl=39 time=205 ms
64 bytes from lb-140-82-114-18-iad.github.com (140.82.114.18): icmp_seq=2 ttl=39 time=228 ms
^C
--- github.de ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1001ms
rtt min/avg/max/mdev = 205.156/216.759/228.363/11.603 ms
$ ping -6 github.com
ping: github.de: Address family for hostname not supported