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#### ip::address_v4::netmask

Obtain the netmask that corresponds to the address, based on its address class.

    static address_v4 netmask(
        const address_v4 & addr);

| Copyright © 2003-2012 Christopher M. Kohlhoff Distributed under the Boost Software License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)