[#boost-urls-ipv4_address-max_str_len]
= xref:boost.adoc[boost]::xref:boost/urls.adoc[urls]::xref:boost/urls/ipv4_address.adoc[ipv4&lowbar;address]::max&lowbar;str&lowbar;len
:relfileprefix: ../../../
:mrdocs:

The number of characters in the longest possible IPv4 string&period;

== Synopsis

Declared in `&lt;https://www.github.com/boostorg/url/blob/develop/include/boost/url/ipv4_address.hpp#Lundefined[boost&sol;url&sol;ipv4&lowbar;address&period;hpp]&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
inline constexpr static
std::size&lowbar;t max&lowbar;str&lowbar;len = 15;
----

== Description

The longest ipv4 address string is &quot;255&period;255&period;255&period;255&quot;&period;


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