[#boost-urls-ipv4_address_rule]
= xref:boost.adoc[boost]::xref:boost/urls.adoc[urls]::ipv4_address_rule
:relfileprefix: ../../
:mrdocs:


Rule for an IP version 4 style address

== Synopsis


Declared in `<https://www.github.com/boostorg/url/blob/develop/include/boost/url/rfc/ipv4_address_rule.hpp#L109[boost/url/rfc/ipv4_address_rule.hpp]>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
constexpr /* implementation-defined */::xref:boost/urls/implementation_defined/ipv4_address_rule_t.adoc[ipv4_address_rule_t] ipv4_address_rule = {};
----

== Description



=== Value Type

[,cpp]
----
using value_type = ipv4_address;
----

=== Example

Rules are used with the function xref:boost/urls/grammar/parse-02.adoc[grammar::parse].

[,cpp]
----
system::result< ipv4_address > rv = grammar::parse( "192.168.0.1", ipv4_address_rule );
----

=== BNF

[,cpp]
----
IPv4address = dec-octet "." dec-octet "." dec-octet "." dec-octet

dec-octet   = DIGIT                 ; 0-9
            / %x31-39 DIGIT         ; 10-99
            / "1" 2DIGIT            ; 100-199
            / "2" %x30-34 DIGIT     ; 200-249
            / "25" %x30-35          ; 250-255
----

=== Specification

* link:https://en.wikipedia.org/wiki/IPv4[IPv4 (Wikipedia)]
    
* link:https://datatracker.ietf.org/doc/html/rfc3986#section-3.2.2[3&period;2&period;2&period; Host (rfc3986)]



== See Also


xref:boost/urls/ipv4_address.adoc[ipv4&lowbar;address],        xref:boost/urls/parse_ipv4_address.adoc[parse&lowbar;ipv4&lowbar;address],        xref:boost/urls/grammar/parse-02.adoc[grammar&colon;&colon;parse]&period;






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