To test absolute DNS name us can use `curl`
```
[root@safarov-server ~]# curl -v telnet://ipv6.test-ipv6.com.:80
* Rebuilt URL to: telnet://ipv6.test-ipv6.com.:80/
* Trying 2001:470:1:18::115...
* TCP_NODELAY set
* Connected to
ipv6.test-ipv6.com (2001:470:1:18::115) port 80 (#0)
```
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