# virsh -c esx://root@[2620:52:0:49d4:ee2a:72ff:fe0a:7baa]/?no_verify=1
error: failed to connect to the hypervisor
error: internal error: IP address lookup for host '2620:52:0:49d4:ee2a:72ff:fe0a:7baa' failed: Address family for hostname not supported

# ssh root@2620:52:0:49d4:ee2a:72ff:fe0a:7baa
The authenticity of host '2620:52:0:49d4:ee2a:72ff:fe0a:7baa (2620:52:0:49d4:ee2a:72ff:fe0a:7baa)' can't be established.
ECDSA key fingerprint is SHA256:kV9S4wQ7Amf6K+Gfkl8MeLKsPZ2OyS/3dfQq0TEMONc.
This host key is known by the following other names/addresses:
    ~/.ssh/known_hosts:10: 10.73.212.36
Are you sure you want to continue connecting (yes/no/[fingerprint])? yes
Warning: Permanently added '2620:52:0:49d4:ee2a:72ff:fe0a:7baa' (ECDSA) to the list of known hosts.
(root@2620:52:0:49d4:ee2a:72ff:fe0a:7baa) Password: 
The time and date of this login have been sent to the system logs.
WARNING:
   All commands run on the ESXi shell are logged and may be included in
   support bundles. Do not provide passwords directly on the command line.
   Most tools can prompt for secrets or accept them from standard input.
VMware offers powerful and supported automation tools. Please
see https://developer.vmware.com for details.
The ESXi Shell can be disabled by an administrative user. See the
vSphere Security documentation for more information.
[root@dell-per750-10:~] 

# virsh -c esx://root@10.73.212.36/?no_verify=1
Enter root's password for 10.73.212.36: 
Welcome to virsh, the virtualization interactive terminal.
Type:  'help' for help with commands
       'quit' to quit
virsh # 

# virsh -c qemu+ssh://root@[2620:52:0:49b2:2eea:7fff:feed:a750]/system
The authenticity of host '2620:52:0:49b2:2eea:7fff:feed:a750 (2620:52:0:49b2:2eea:7fff:feed:a750)' can't be established.
ED25519 key fingerprint is SHA256:+q84GlSj4oNEPm5DTlVWJMf3cf0TLaLPVo75AbuZlWs.
This host key is known by the following other names/addresses:
    ~/.ssh/known_hosts:17: 10.73.178.59
Are you sure you want to continue connecting (yes/no/[fingerprint])? yes
root@2620:52:0:49b2:2eea:7fff:feed:a750's password: 
root@2620:52:0:49b2:2eea:7fff:feed:a750's password: 
Welcome to virsh, the virtualization interactive terminal.
Type:  'help' for help with commands
       'quit' to quit
virsh #