:relfileprefix: ../../../ [#boost-urls-ipv6_address-is_v4_mapped] == xref:boost.adoc[pass:[boost]]::xref:boost/urls.adoc[pass:[urls]]::xref:boost/urls/ipv6_address.adoc[pass:[ipv6_address]]::is_v4_mapped Return true if the address is a mapped IPv4 address === Synopsis Declared in header `` [source,cpp,subs="verbatim,macros,-callouts"] ---- bool is_v4_mapped() const noexcept; ---- === Description This address type is used to represent the addresses of IPv4 nodes as IPv6 addresses. * link:https://datatracker.ietf.org/doc/html/rfc4291#section-2.5.5.2[ 2.5.5.2. IPv4-Mapped IPv6 Address (rfc4291)]