[#boost-urls-ipv6_address-is_loopback]
= xref:boost.adoc[boost]::xref:boost/urls.adoc[urls]::xref:boost/urls/ipv6_address.adoc[ipv6_address]::is_loopback
:relfileprefix: ../../../
:mrdocs:


Return true if the address is a loopback address

== Synopsis


Declared in `<https://www.github.com/boostorg/url/blob/develop/include/boost/url/ipv6_address.hpp#L275[boost/url/ipv6_address.hpp]>`

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

== Description


The unicast address 0:0:0:0:0:0:0:1 is called        the loopback address. It may be used by a node        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)]





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