There are two addresses which contain an IPv4 address.
188.8.131.52. IPv4-mapped IPv6 address
IPv4-only IPv6-compatible addresses are sometimes used/shown for sockets created by an IPv6-enabled daemon, but only binding to an IPv4 address.
These addresses are defined with a special prefix of length 96 (a.b.c.d is the IPv4 address):
or in compressed format
For example, the IPv4 address 184.108.40.206 looks like this: