$ curl -v -6 http://example.com
*   Trying 2606:2800:220:1:248:1893:25c8:1946:80...
* Immediate connect fail for 2606:2800:220:1:248:1893:25c8:1946: Сеть недоступна
* Closing connection 0
curl: (7) Couldn't connect to server

$ curl -v -6 https://example.com
*   Trying 2606:2800:220:1:248:1893:25c8:1946:443...
* Immediate connect fail for 2606:2800:220:1:248:1893:25c8:1946: Сеть недоступна
* Closing connection 0
curl: (7) Couldn't connect to server