For IPv4 you should use 88.208.31.2 .
To get IPv6 you should add your domain to vCDN first(via panel or via ticket). After passing few minutes you can check IPv6 for your domain.
# For Windows, MacOS nslookup -query=AAAA vcdn.example.com ns1.ahcdn.com Answer will look like vcdn.example.com has AAAA address 2a02:b48:8800::123:4567
# For Linux dig +short vcdn.example.com @ns1.ahcdn.com AAAA or host -t AAAA vcdn.example.com ns1.ahcdn.com