:relfileprefix: ../../
[#boost-urls-ipv4_address_rule]

== xref:boost.adoc[pass:[boost]]::xref:boost/urls.adoc[pass:[urls]]::ipv4_address_rule


Rule for an IP version 4 style address


=== Synopsis

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

[source,cpp,subs="verbatim,macros,-callouts"]
----
constexpr
pass:q[_implementation-defined_] ipv4_address_rule = {};
----

=== Description

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

=== Rules are used with the function

xref:boost/urls/grammar/parse-06.adoc[grammar::parse]
.
[,cpp]
----
system::result< ipv4_address > rv = grammar::parse( "192.168.0.1", ipv4_address_rule );
----
[,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
----

* link:https://en.wikipedia.org/wiki/IPv4[IPv4 (Wikipedia)]

* link:https://datatracker.ietf.org/doc/html/rfc3986#section-3.2.2[3.2.2. Host (rfc3986)]



=== See Also


xref:boost/urls/ipv4_address.adoc[ipv4_address]
,
xref:boost/urls/parse_ipv4_address.adoc[parse_ipv4_address]
,
xref:boost/urls/grammar/parse-06.adoc[grammar::parse]
.