:relfileprefix: ../../../
[#DC200863044BFE53976D53EF543006D709B007AA]

= Function ipv6_address::is_loopback

pass:v,q[Return true if the address is a loopback address]


== Synopsis

Declared in header `</boost/url/ipv6_address.hpp#L275[boost/url/ipv6_address.hpp,window=blank_]>`

[source,cpp,subs="verbatim,macros,-callouts"]
----
bool
is_loopback() const noexcept;
----

== Description

pass:v,q[The unicast address 0:0:0:0:0:0:0:1 is called] pass:v,q[the loopback address. It may be used by a node]
pass:v,q[to send an IPv6 packet to itself.]

=== Specification

* link:https://datatracker.ietf.org/doc/html/rfc4291#section-2.5.3[            2.5.3. The Loopback Address (rfc4291)]



== Return Value

* `bool`