$ ping speedtest.net PING speedtest.net(2a04:4e42:600::731 (2a04:4e42:600::731)) 56 data bytes 64 bytes from 2a04:4e42:600::731 (2a04:4e42:600::731): icmp_seq=1 ttl=60 time=36.10 ms 64 bytes from 2a04:4e42:600::731 (2a04:4e42:600::731): icmp_seq=2 ttl=60 time=37.0 ms 64 bytes from 2a04:4e42:600::731 (2a04:4e42:600::731): icmp_seq=3 ttl=60 time=36.10 ms 64 bytes from 2a04:4e42:600::731 (2a04:4e42:600::731): icmp_seq=4 ttl=60 time=36.10 ms
$ ping 2a04:4e42:600::731 ping: Unknown host: 2a04:4e42:600::731