IPv6
$ host 38207162722.isikukood.ee
…has IPv6 address 2a01:4f9:c013:bea2::382:716:2722
$ ping 38207162722.isikukood.ee
PING 38207162722.isikukood.ee (2a01:4f9:c013:bea2:0:382:716:2722) 56 data bytes
64 bytes from 2a01:4f9:c013:bea2:0:382:716:2722: icmp_seq=1 ttl=50 time=234 ms
$ ping 2a01:4f9:c013:bea2:0:382:716:2721
PING 2a01:4f9:c013:bea2:0:382:716:2721 (2a01:4f9:c013:bea2:0:382:716:2721) 56 data bytes
From 2a01:4f9:c013:bea2:0:382:716:2721 icmp_seq=1 Destination unreachable: Reject route to destination