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


Return true if the address is unspecified

== Synopsis


Declared in `<https://www.github.com/boostorg/url/blob/develop/include/boost/url/ipv6_address.hpp#L261[boost/url/ipv6_address.hpp]>`

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

== Description


The address 0:0:0:0:0:0:0:0 is called the        unspecified address. It indicates the        absence of an address.


=== Specification

* link:https://datatracker.ietf.org/doc/html/rfc4291#section-2.5.2[            2.5.2. The Unspecified Address (rfc4291)]





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