In the transition from IPv4 to IPv6, there is a need for hosts on IPv6 networks to reference devices on IPv4 networks that do not have valid IPv6 addresses. Any valid IPv4 address can be converted to an IPv6 address. Inputting Google's IPv4 address 142.250.65.206 into the "IPv4 to IPv6" tool generates these IPv6 addresses:

IPv6 Address Canonical String * ::ffff:8efa:41ce
IPv6 Address Mixed String** ::ffff:142.250.65.206
IPv6 Address Full String** ::ffff:142.250.65.206
IPv6 Address Normalized String 0:0:0:0:0:ffff:8efa:41ce

IPv6 Address Reverse DNS Lookup String e.c.1.4.a.f.e.8.f.f.f.f.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.ip6.arpa

* Canonical String is similar to 6 to 4 notation
** Mixed and Full is similar to IPv4 mapped

These converted IPv6 addresses will be temporary until everyone registers new IPv6 replacements for their current IPv4 addresses.

The "Network Tools" "DNS" can be used to find registered IPv6 addresses. For example, entering "Google.com" will show Google's IPv4 address (142.250.65.206) and its registered IPv6 address of "2607:f8b0:4006:81d::200e", which is different than its converted IPv6 addresses.