IPv6 - loopback address
IPv6 has reserved a special address to be used as the loopback address. This address is used by a node to send an IPv6 packet to itself. The reserved address is the following:
0:0:0:0:0:0:0:1/128 also written as ::1/128
The IPv4 counterpart IPv4 - Internal Host Loopback Address Range is defined as:
127.0.0.0/8