IPinfo supports IPv6 connection equally to IPv4 connection. Even in our database, we include IPv4 and IPv6 IPs in one file. Our browser natively supports IPv6 connection through our standard ipinfo.io domain.
Because if we have A and AAAA records for the domain (so its supports v4 or v6) the users would get their v6 address back when they go to ipinfo.io (tools usually default to v6 if it’s available), which is not usually what they expect.
Again for IPv6 connection, the endpoint for IPinfo’s API is