class IPAddress::IPv6::Loopback

The loopback  address is a unicast localhost address. If an

application in a host sends packets to this address, the IPv6 stack will loop these packets back on the same virtual interface.

Loopback addresses are expressed in the following form:

::1

or, with their appropriate prefix,

::1/128

As for the unspecified addresses, IPv6 loopbacks can be created with IPAddress calling their own class:

ip = IPAddress::IPv6::Loopback.new

ip.to_string
  #=> "::1/128"

or by using the wrapper:

ip = IPAddress "::1"

ip.to_string
  #=> "::1/128"

Checking if an address is loopback is easy with the IPv6#loopback? method:

ip.loopback?
  #=> true

The IPv6 loopback address corresponds to 127.0.0.1 in IPv4.